关于 用 js 实现 快照功能

1.前言

前段时间有个需求，想要 打印一个小票凭证 ，实现这个功能，我首先想到了快照，

就是将数据内容排版好，然后截图或者用其他方式将内容 制作成图片 ，然后下载下来打印即可。

2.探讨

为何不直接以文件的形式打印呢？原因是用文件排版【包含文字和图片内容】，太复杂了，效果和稳定性不确定，还不如用快照，简单省事，效果也好。

3.效果

【图一】输入动态数据

【图二】js排版，放在一个div里面

【图三】触发生成快照并网页本地下载 ，【如果是要分享，则将图片上传服务器，存储后，获取访问该图片的网址路径，将路径分享即可】

 【图四】本地下载的图片文件

【图五】

效果如何？我觉得挺好的，二维码是我后台生成的，用路径获取即可

4.实现原理

其实这都多亏了html2canvas库 ，这是一个js版本操作画布canvas的一个集成库，调用api设置参数即可自定义内容，

问题是，直接使用html2canvas 会导致内容模糊、字迹不清晰等问题，还需要其他的辅助算法才可以制作清晰的快照。

/*
  html2canvas 0.5.0-beta3 <http://html2canvas.hertzen.com>
  Copyright (c) 2016 Niklas von Hertzen

  Released under  License
*/
!function (e) {
    if ("object" == typeof exports && "undefined" != typeof module) module.exports = e(); else if ("function" == typeof define && define.amd) define([], e); else {
        var n;
        "undefined" != typeof window ? n = window : "undefined" != typeof global ? n = global : "undefined" != typeof self && (n = self), n.html2canvas = e()
    }
}(function () {
    var e;
    return function n(e, f, o) {
        function d(t, l) {
            if (!f[t]) {
                if (!e[t]) {
                    var s = "function" == typeof require && require;
                    if (!l && s) return s(t, !0);
                    if (i) return i(t, !0);
                    var u = new Error("Cannot find module '" + t + "'");
                    throw u.code = "MODULE_NOT_FOUND", u
                }
                var a = f[t] = {exports: {}};
                e[t][0].call(a.exports, function (n) {
                    var f = e[t][1][n];
                    return d(f ? f : n)
                }, a, a.exports, n, e, f, o)
            }
            return f[t].exports
        }

        for (var i = "function" == typeof require && require, t = 0; t < o.length; t++) d(o[t]);
        return d
    }({
        1: [function (n, f, o) {
            (function (n) {
                !function (d) {
                    function i(e) {
                        throw RangeError(I[e])
                    }

                    function t(e, n) {
                        for (var f = e.length; f--;) e[f] = n(e[f]);
                        return e
                    }

                    function l(e, n) {
                        return t(e.split(H), n).join(".")
                    }

                    function s(e) {
                        for (var n, f, o = [], d = 0, i = e.length; i > d;) n = e.charCodeAt(d++), n >= 55296 && 56319 >= n && i > d ? (f = e.charCodeAt(d++), 56320 == (64512 & f) ? o.push(((1023 & n) << 10) + (1023 & f) + 65536) : (o.push(n), d--)) : o.push(n);
                        return o
                    }

                    function u(e) {
                        return t(e, function (e) {
                            var n = "";
                            return e > 65535 && (e -= 65536, n += L(e >>> 10 & 1023 | 55296), e = 56320 | 1023 & e), n += L(e)
                        }).join("")
                    }

                    function a(e) {
                        return 10 > e - 48 ? e - 22 : 26 > e - 65 ? e - 65 : 26 > e - 97 ? e - 97 : k
                    }

                    function p(e, n) {
                        return e + 22 + 75 * (26 > e) - ((0 != n) << 5)
                    }

                    function c(e, n, f) {
                        var o = 0;
                        for (e = f ? K(e / B) : e >> 1, e += K(e / n); e > J * z >> 1; o += k) e = K(e / J);
                        return K(o + (J + 1) * e / (e + A))
                    }

                    function y(e) {
                        var n, f, o, d, t, l, s, p, y, m, r = [], v = e.length, w = 0, b = D, g = C;
                        for (f = e.lastIndexOf(E), 0 > f && (f = 0), o = 0; f > o; ++o) e.charCodeAt(o) >= 128 && i("not-basic"), r.push(e.charCodeAt(o));
                        for (d = f > 0 ? f + 1 : 0; v > d;) {
                            for (t = w, l = 1, s = k; d >= v && i("invalid-input"), p = a(e.charCodeAt(d++)), (p >= k || p > K((j - w) / l)) && i("overflow"), w += p * l, y = g >= s ? q : s >= g + z ? z : s - g, !(y > p); s += k) m = k - y, l > K(j / m) && i("overflow"), l *= m;
                            n = r.length + 1, g = c(w - t, n, 0 == t), K(w / n) > j - b && i("overflow"), b += K(w / n), w %= n, r.splice(w++, 0, b)
                        }
                        return u(r)
                    }

                    function m(e) {
                        var n, f, o, d, t, l, u, a, y, m, r, v, w, b, g, h = [];
                        for (e = s(e), v = e.length, n = D, f = 0, t = C, l = 0; v > l; ++l) r = e[l], 128 > r && h.push(L(r));
                        for (o = d = h.length, d && h.push(E); v > o;) {
                            for (u = j, l = 0; v > l; ++l) r = e[l], r >= n && u > r && (u = r);
                            for (w = o + 1, u - n > K((j - f) / w) && i("overflow"), f += (u - n) * w, n = u, l = 0; v > l; ++l) if (r = e[l], n > r && ++f > j && i("overflow"), r == n) {
                                for (a = f, y = k; m = t >= y ? q : y >= t + z ? z : y - t, !(m > a); y += k) g = a - m, b = k - m, h.push(L(p(m + g % b, 0))), a = K(g / b);
                                h.push(L(p(a, 0))), t = c(f, w, o == d), f = 0, ++o
                            }
                            ++f, ++n
                        }
                        return h.join("")
                    }

                    function r(e) {
                        return l(e, function (e) {
                            return F.test(e) ? y(e.slice(4).toLowerCase()) : e
                        })
                    }

                    function v(e) {
                        return l(e, function (e) {
                            return G.test(e) ? "xn--" + m(e) : e
                        })
                    }

                    var w = "object" == typeof o && o, b = "object" == typeof f && f && f.exports == w && f,
                        g = "object" == typeof n && n;
                    (g.global === g || g.window === g) && (d = g);
                    var h, x, j = 2147483647, k = 36, q = 1, z = 26, A = 38, B = 700, C = 72, D = 128, E = "-",
                        F = /^xn--/, G = /[^ -~]/, H = /x2E|u3002|uFF0E|uFF61/g, I = {
                            overflow: "Overflow: input needs wider integers to process",
                            "not-basic": "Illegal input >= 0x80 (not a basic code point)",
                            "invalid-input": "Invalid input"
                        }, J = k - q, K = Math.floor, L = String.fromCharCode;
                    if (h = {
                        version: "1.2.4",
                        ucs2: {decode: s, encode: u},
                        decode: y,
                        encode: m,
                        toASCII: v,
                        toUnicode: r
                    }, "function" == typeof e && "object" == typeof e.amd && e.amd) e("punycode", function () {
                        return h
                    }); else if (w && !w.nodeType) if (b) b.exports = h; else for (x in h) h.hasOwnProperty(x) && (w[x] = h[x]); else d.punycode = h
                }(this)
            }).call(this, "undefined" != typeof global ? global : "undefined" != typeof self ? self : "undefined" != typeof window ? window : {})
        }, {}], 2: [function (e, n) {
            function f(e, n, f) {
                !e.defaultView || n === e.defaultView.pageXOffset && f === e.defaultView.pageYOffset || e.defaultView.scrollTo(n, f)
            }

            function o(e, n) {
                try {
                    n && (n.width = e.width, n.height = e.height, n.getContext("2d").putImageData(e.getContext("2d").getImageData(0, 0, e.width, e.height), 0, 0))
                } catch (f) {
                    t("Unable to copy canvas content from", e, f)
                }
            }

            function d(e, n) {
                for (var f = 3 === e.nodeType ? document.createTextNode(e.nodeValue) : e.cloneNode(!1), i = e.firstChild; i;) (n === !0 || 1 !== i.nodeType || "SCRIPT" !== i.nodeName) && f.appendChild(d(i, n)), i = i.nextSibling;
                return 1 === e.nodeType && (f._scrollTop = e.scrollTop, f._scrollLeft = e.scrollLeft, "CANVAS" === e.nodeName ? o(e, f) : ("TEXTAREA" === e.nodeName || "SELECT" === e.nodeName) && (f.value = e.value)), f
            }

            function i(e) {
                if (1 === e.nodeType) {
                    e.scrollTop = e._scrollTop, e.scrollLeft = e._scrollLeft;
                    for (var n = e.firstChild; n;) i(n), n = n.nextSibling
                }
            }

            var t = e("./log");
            n.exports = function (e, n, o, t, l, s, u) {
                var a = d(e.documentElement, l.javascriptEnabled), p = n.createElement("iframe");
                return p.className = "html2canvas-container", p.style.visibility = "hidden", p.style.position = "fixed", p.style.left = "-10000px", p.style.top = "0px", p.style.border = "0", p.width = o, p.height = t, p.scrolling = "no", n.body.appendChild(p), new Promise(function (n) {
                    var o = p.contentWindow.document;
                    p.contentWindow.onload = p.onload = function () {
                        var e = setInterval(function () {
                            o.body.childNodes.length > 0 && (i(o.documentElement), clearInterval(e), "view" === l.type && (p.contentWindow.scrollTo(s, u), !/(iPad|iPhone|iPod)/g.test(navigator.userAgent) || p.contentWindow.scrollY === u && p.contentWindow.scrollX === s || (o.documentElement.style.top = -u + "px", o.documentElement.style.left = -s + "px", o.documentElement.style.position = "absolute")), n(p))
                        }, 50)
                    }, o.open(), o.write("<!DOCTYPE html><html></html>"), f(e, s, u), o.replaceChild(o.adoptNode(a), o.documentElement), o.close()
                })
            }
        }, {"./log": 13}], 3: [function (e, n) {
            function f(e) {
                this.r = 0, this.g = 0, this.b = 0, this.a = null;
                this.fromArray(e) || this.namedColor(e) || this.rgb(e) || this.rgba(e) || this.hex6(e) || this.hex3(e)
            }

            f.prototype.darken = function (e) {
                var n = 1 - e;
                return new f([Math.round(this.r * n), Math.round(this.g * n), Math.round(this.b * n), this.a])
            }, f.prototype.isTransparent = function () {
                return 0 === this.a
            }, f.prototype.isBlack = function () {
                return 0 === this.r && 0 === this.g && 0 === this.b
            }, f.prototype.fromArray = function (e) {
                return Array.isArray(e) && (this.r = Math.min(e[0], 255), this.g = Math.min(e[1], 255), this.b = Math.min(e[2], 255), e.length > 3 && (this.a = e[3])), Array.isArray(e)
            };
            var o = /^#([a-f0-9]{3})$/i;
            f.prototype.hex3 = function (e) {
                var n = null;
                return null !== (n = e.match(o)) && (this.r = parseInt(n[1][0] + n[1][0], 16), this.g = parseInt(n[1][1] + n[1][1], 16), this.b = parseInt(n[1][2] + n[1][2], 16)), null !== n
            };
            var d = /^#([a-f0-9]{6})$/i;
            f.prototype.hex6 = function (e) {
                var n = null;
                return null !== (n = e.match(d)) && (this.r = parseInt(n[1].substring(0, 2), 16), this.g = parseInt(n[1].substring(2, 4), 16), this.b = parseInt(n[1].substring(4, 6), 16)), null !== n
            };
            var i = /^rgb(s*(d{1,3})s*,s*(d{1,3})s*,s*(d{1,3})s*)$/;
            f.prototype.rgb = function (e) {
                var n = null;
                return null !== (n = e.match(i)) && (this.r = Number(n[1]), this.g = Number(n[2]), this.b = Number(n[3])), null !== n
            };
            var t = /^rgba(s*(d{1,3})s*,s*(d{1,3})s*,s*(d{1,3})s*,s*(d?.?d+)s*)$/;
            f.prototype.rgba = function (e) {
                var n = null;
                return null !== (n = e.match(t)) && (this.r = Number(n[1]), this.g = Number(n[2]), this.b = Number(n[3]), this.a = Number(n[4])), null !== n
            }, f.prototype.toString = function () {
                return null !== this.a && 1 !== this.a ? "rgba(" + [this.r, this.g, this.b, this.a].join(",") + ")" : "rgb(" + [this.r, this.g, this.b].join(",") + ")"
            }, f.prototype.namedColor = function (e) {
                e = e.toLowerCase();
                var n = l[e];
                if (n) this.r = n[0], this.g = n[1], this.b = n[2]; else if ("transparent" === e) return this.r = this.g = this.b = this.a = 0, !0;
                return !!n
            }, f.prototype.isColor = !0;
            var l = {
                aliceblue: [240, 248, 255],
                antiquewhite: [250, 235, 215],
                aqua: [0, 255, 255],
                aquamarine: [127, 255, 212],
                azure: [240, 255, 255],
                beige: [245, 245, 220],
                bisque: [255, 228, 196],
                black: [0, 0, 0],
                blanchedalmond: [255, 235, 205],
                blue: [0, 0, 255],
                blueviolet: [138, 43, 226],
                brown: [165, 42, 42],
                burlywood: [222, 184, 135],
                cadetblue: [95, 158, 160],
                chartreuse: [127, 255, 0],
                chocolate: [210, 105, 30],
                coral: [255, 127, 80],
                cornflowerblue: [100, 149, 237],
                cornsilk: [255, 248, 220],
                crimson: [220, 20, 60],
                cyan: [0, 255, 255],
                darkblue: [0, 0, 139],
                darkcyan: [0, 139, 139],
                darkgoldenrod: [184, 134, 11],
                darkgray: [169, 169, 169],
                darkgreen: [0, 100, 0],
                darkgrey: [169, 169, 169],
                darkkhaki: [189, 183, 107],
                darkmagenta: [139, 0, 139],
                darkolivegreen: [85, 107, 47],
                darkorange: [255, 140, 0],
                darkorchid: [153, 50, 204],
                darkred: [139, 0, 0],
                darksalmon: [233, 150, 122],
                darkseagreen: [143, 188, 143],
                darkslateblue: [72, 61, 139],
                darkslategray: [47, 79, 79],
                darkslategrey: [47, 79, 79],
                darkturquoise: [0, 206, 209],
                darkviolet: [148, 0, 211],
                deeppink: [255, 20, 147],
                deepskyblue: [0, 191, 255],
                dimgray: [105, 105, 105],
                dimgrey: [105, 105, 105],
                dodgerblue: [30, 144, 255],
                firebrick: [178, 34, 34],
                floralwhite: [255, 250, 240],
                forestgreen: [34, 139, 34],
                fuchsia: [255, 0, 255],
                gainsboro: [220, 220, 220],
                ghostwhite: [248, 248, 255],
                gold: [255, 215, 0],
                goldenrod: [218, 165, 32],
                gray: [128, 128, 128],
                green: [0, 128, 0],
                greenyellow: [173, 255, 47],
                grey: [128, 128, 128],
                honeydew: [240, 255, 240],
                hotpink: [255, 105, 180],
                indianred: [205, 92, 92],
                indigo: [75, 0, 130],
                ivory: [255, 255, 240],
                khaki: [240, 230, 140],
                lavender: [230, 230, 250],
                lavenderblush: [255, 240, 245],
                lawngreen: [124, 252, 0],
                lemonchiffon: [255, 250, 205],
                lightblue: [173, 216, 230],
                lightcoral: [240, 128, 128],
                lightcyan: [224, 255, 255],
                lightgoldenrodyellow: [250, 250, 210],
                lightgray: [211, 211, 211],
                lightgreen: [144, 238, 144],
                lightgrey: [211, 211, 211],
                lightpink: [255, 182, 193],
                lightsalmon: [255, 160, 122],
                lightseagreen: [32, 178, 170],
                lightskyblue: [135, 206, 250],
                lightslategray: [119, 136, 153],
                lightslategrey: [119, 136, 153],
                lightsteelblue: [176, 196, 222],
                lightyellow: [255, 255, 224],
                lime: [0, 255, 0],
                limegreen: [50, 205, 50],
                linen: [250, 240, 230],
                magenta: [255, 0, 255],
                maroon: [128, 0, 0],
                mediumaquamarine: [102, 205, 170],
                mediumblue: [0, 0, 205],
                mediumorchid: [186, 85, 211],
                mediumpurple: [147, 112, 219],
                mediumseagreen: [60, 179, 113],
                mediumslateblue: [123, 104, 238],
                mediumspringgreen: [0, 250, 154],
                mediumturquoise: [72, 209, 204],
                mediumvioletred: [199, 21, 133],
                midnightblue: [25, 25, 112],
                mintcream: [245, 255, 250],
                mistyrose: [255, 228, 225],
                moccasin: [255, 228, 181],
                navajowhite: [255, 222, 173],
                navy: [0, 0, 128],
                oldlace: [253, 245, 230],
                olive: [128, 128, 0],
                olivedrab: [107, 142, 35],
                orange: [255, 165, 0],
                orangered: [255, 69, 0],
                orchid: [218, 112, 214],
                palegoldenrod: [238, 232, 170],
                palegreen: [152, 251, 152],
                paleturquoise: [175, 238, 238],
                palevioletred: [219, 112, 147],
                papayawhip: [255, 239, 213],
                peachpuff: [255, 218, 185],
                peru: [205, 133, 63],
                pink: [255, 192, 203],
                plum: [221, 160, 221],
                powderblue: [176, 224, 230],
                purple: [128, 0, 128],
                rebeccapurple: [102, 51, 153],
                red: [255, 0, 0],
                rosybrown: [188, 143, 143],
                royalblue: [65, 105, 225],
                saddlebrown: [139, 69, 19],
                salmon: [250, 128, 114],
                sandybrown: [244, 164, 96],
                seagreen: [46, 139, 87],
                seashell: [255, 245, 238],
                sienna: [160, 82, 45],
                silver: [192, 192, 192],
                skyblue: [135, 206, 235],
                slateblue: [106, 90, 205],
                slategray: [112, 128, 144],
                slategrey: [112, 128, 144],
                snow: [255, 250, 250],
                springgreen: [0, 255, 127],
                steelblue: [70, 130, 180],
                tan: [210, 180, 140],
                teal: [0, 128, 128],
                thistle: [216, 191, 216],
                tomato: [255, 99, 71],
                turquoise: [64, 224, 208],
                violet: [238, 130, 238],
                wheat: [245, 222, 179],
                white: [255, 255, 255],
                whitesmoke: [245, 245, 245],
                yellow: [255, 255, 0],
                yellowgreen: [154, 205, 50]
            };
            n.exports = f
        }, {}], 4: [function (n, f) {
            function o(e, n) {
                var f = j++;
                if (n = n || {}, n.logging && (v.options.logging = !0, v.options.start = Date.now()), n.async = "undefined" == typeof n.async ? !0 : n.async, n.allowTaint = "undefined" == typeof n.allowTaint ? !1 : n.allowTaint, n.removeContainer = "undefined" == typeof n.removeContainer ? !0 : n.removeContainer, n.javascriptEnabled = "undefined" == typeof n.javascriptEnabled ? !1 : n.javascriptEnabled, n.imageTimeout = "undefined" == typeof n.imageTimeout ? 1e4 : n.imageTimeout, n.renderer = "function" == typeof n.renderer ? n.renderer : c, n.strict = !!n.strict, "string" == typeof e) {
                    if ("string" != typeof n.proxy) return Promise.reject("Proxy must be used when rendering url");
                    var o = null != n.width ? n.width : window.innerWidth,
                        t = null != n.height ? n.height : window.innerHeight;
                    return g(a(e), n.proxy, document, o, t, n).then(function (e) {
                        return i(e.contentWindow.document.documentElement, e, n, o, t)
                    })
                }
                var l = (void 0 === e ? [document.documentElement] : e.length ? e : [e])[0];
                return l.setAttribute(x + f, f), d(l.ownerDocument, n, l.ownerDocument.defaultView.innerWidth, l.ownerDocument.defaultView.innerHeight, f).then(function (e) {
                    return "function" == typeof n.onrendered && (v("options.onrendered is deprecated, html2canvas returns a Promise containing the canvas"), n.onrendered(e)), e
                })
            }

            function d(e, n, f, o, d) {
                return b(e, e, f, o, n, e.defaultView.pageXOffset, e.defaultView.pageYOffset).then(function (t) {
                    v("Document cloned");
                    var l = x + d, s = "[" + l + "='" + d + "']";
                    e.querySelector(s).removeAttribute(l);
                    var u = t.contentWindow, a = u.document.querySelector(s),
                        p = Promise.resolve("function" == typeof n.onclone ? n.onclone(u.document) : !0);
                    return p.then(function () {
                        return i(a, t, n, f, o)
                    })
                })
            }

            function i(e, n, f, o, d) {
                var i = n.contentWindow, a = new p(i.document), c = new y(f, a), r = h(e),
                    w = "view" === f.type ? o : s(i.document), b = "view" === f.type ? d : u(i.document),
                    g = new f.renderer(w, b, c, f, document), x = new m(e, g, a, c, f);
                return x.ready.then(function () {
                    v("Finished rendering");
                    var o;
                    return o = "view" === f.type ? l(g.canvas, {
                         g.canvas.width,
                        height: g.canvas.height,
                        top: 0,
                        left: 0,
                        x: 0,
                        y: 0
                    }) : e === i.document.body || e === i.document.documentElement || null != f.canvas ? g.canvas : l(g.canvas, {
                         null != f.width ? f.width : r.width,
                        height: null != f.height ? f.height : r.height,
                        top: r.top,
                        left: r.left,
                        x: 0,
                        y: 0
                    }), t(n, f), o
                })
            }

            function t(e, n) {
                n.removeContainer && (e.parentNode.removeChild(e), v("Cleaned up container"))
            }

            function l(e, n) {
                var f = document.createElement("canvas"), o = Math.min(e.width - 1, Math.max(0, n.left)),
                    d = Math.min(e.width, Math.max(1, n.left + n.width)),
                    i = Math.min(e.height - 1, Math.max(0, n.top)),
                    t = Math.min(e.height, Math.max(1, n.top + n.height));
                f.width = n.width, f.height = n.height;
                var l = d - o, s = t - i;
                return v("Cropping canvas at:", "left:", n.left, "top:", n.top, "", l, "height:", s), v("Resulting crop with width", n.width, "and height", n.height, "with x", o, "and y", i), f.getContext("2d").drawImage(e, o, i, l, s, n.x, n.y, l, s), f
            }

            function s(e) {
                return Math.max(Math.max(e.body.scrollWidth, e.documentElement.scrollWidth), Math.max(e.body.offsetWidth, e.documentElement.offsetWidth), Math.max(e.body.clientWidth, e.documentElement.clientWidth))
            }

            function u(e) {
                return Math.max(Math.max(e.body.scrollHeight, e.documentElement.scrollHeight), Math.max(e.body.offsetHeight, e.documentElement.offsetHeight), Math.max(e.body.clientHeight, e.documentElement.clientHeight))
            }

            function a(e) {
                var n = document.createElement("a");
                return n.href = e, n.href = n.href, n
            }

            var p = n("./support"), c = n("./renderers/canvas"), y = n("./imageloader"), m = n("./nodeparser"),
                r = n("./nodecontainer"), v = n("./log"), w = n("./utils"), b = n("./clone"),
                g = n("./proxy").loadUrlDocument, h = w.getBounds, x = "data-html2canvas-node", j = 0;
            o.CanvasRenderer = c, o.NodeContainer = r, o.log = v, o.utils = w;
            var k = "undefined" == typeof document || "function" != typeof Object.create || "function" != typeof document.createElement("canvas").getContext ? function () {
                return Promise.reject("No canvas support")
            } : o;
            f.exports = k, "function" == typeof e && e.amd && e("html2canvas", [], function () {
                return k
            })
        }, {
            "./clone": 2,
            "./imageloader": 11,
            "./log": 13,
            "./nodecontainer": 14,
            "./nodeparser": 15,
            "./proxy": 16,
            "./renderers/canvas": 20,
            "./support": 22,
            "./utils": 26
        }], 5: [function (e, n) {
            function f(e) {
                if (this.src = e, o("DummyImageContainer for", e), !this.promise || !this.image) {
                    o("Initiating DummyImageContainer"), f.prototype.image = new Image;
                    var n = this.image;
                    f.prototype.promise = new Promise(function (e, f) {
                        n.onload = e, n.onerror = f, n.src = d(), n.complete === !0 && e(n)
                    })
                }
            }

            var o = e("./log"), d = e("./utils").smallImage;
            n.exports = f
        }, {"./log": 13, "./utils": 26}], 6: [function (e, n) {
            function f(e, n) {
                var f, d, i = document.createElement("div"), t = document.createElement("img"),
                    l = document.createElement("span"), s = "Hidden Text";
                i.style.visibility = "hidden", i.style.fontFamily = e, i.style.fontSize = n, i.style.margin = 0, i.style.padding = 0, document.body.appendChild(i), t.src = o(), t.width = 1, t.height = 1, t.style.margin = 0, t.style.padding = 0, t.style.verticalAlign = "baseline", l.style.fontFamily = e, l.style.fontSize = n, l.style.margin = 0, l.style.padding = 0, l.appendChild(document.createTextNode(s)), i.appendChild(l), i.appendChild(t), f = t.offsetTop - l.offsetTop + 1, i.removeChild(l), i.appendChild(document.createTextNode(s)), i.style.lineHeight = "normal", t.style.verticalAlign = "super", d = t.offsetTop - i.offsetTop + 1, document.body.removeChild(i), this.baseline = f, this.lineWidth = 1, this.middle = d
            }

            var o = e("./utils").smallImage;
            n.exports = f
        }, {"./utils": 26}], 7: [function (e, n) {
            function f() {
                this.data = {}
            }

            var o = e("./font");
            f.prototype.getMetrics = function (e, n) {
                return void 0 === this.data[e + "-" + n] && (this.data[e + "-" + n] = new o(e, n)), this.data[e + "-" + n]
            }, n.exports = f
        }, {"./font": 6}], 8: [function (e, n) {
            function f(n, f, o) {
                this.image = null, this.src = n;
                var i = this, t = d(n);
                this.promise = (f ? new Promise(function (e) {
                    "about:blank" === n.contentWindow.document.URL || null == n.contentWindow.document.documentElement ? n.contentWindow.onload = n.onload = function () {
                        e(n)
                    } : e(n)
                }) : this.proxyLoad(o.proxy, t, o)).then(function (n) {
                    var f = e("./core");
                    return f(n.contentWindow.document.documentElement, {
                        type: "view",
                         n.width,
                        height: n.height,
                        proxy: o.proxy,
                        javascriptEnabled: o.javascriptEnabled,
                        removeContainer: o.removeContainer,
                        allowTaint: o.allowTaint,
                        imageTimeout: o.imageTimeout / 2
                    })
                }).then(function (e) {
                    return i.image = e
                })
            }

            var o = e("./utils"), d = o.getBounds, i = e("./proxy").loadUrlDocument;
            f.prototype.proxyLoad = function (e, n, f) {
                var o = this.src;
                return i(o.src, e, o.ownerDocument, n.width, n.height, f)
            }, n.exports = f
        }, {"./core": 4, "./proxy": 16, "./utils": 26}], 9: [function (e, n) {
            function f(e) {
                this.src = e.value, this.colorStops = [], this.type = null, this.x0 = .5, this.y0 = .5, this.x1 = .5, this.y1 = .5, this.promise = Promise.resolve(!0)
            }

            f.TYPES = {
                LINEAR: 1,
                RADIAL: 2
            }, f.REGEXP_COLORSTOP = /^s*(rgba?(s*d{1,3},s*d{1,3},s*d{1,3}(?:,s*[0-9.]+)?s*)|[a-z]{3,20}|#[a-f0-9]{3,6})(?:s+(d{1,3}(?:.d+)?)(%|px)?)?(?:s|$)/i, n.exports = f
        }, {}], 10: [function (e, n) {
            function f(e, n) {
                this.src = e, this.image = new Image;
                var f = this;
                this.tainted = null, this.promise = new Promise(function (o, d) {
                    f.image.onload = o, f.image.onerror = d, n && (f.image.crossOrigin = "anonymous"), f.image.src = e, f.image.complete === !0 && o(f.image)
                })
            }

            n.exports = f
        }, {}], 11: [function (e, n) {
            function f(e, n) {
                this.link = null, this.options = e, this.support = n, this.origin = this.getOrigin(window.location.href)
            }

            var o = e("./log"), d = e("./imagecontainer"), i = e("./dummyimagecontainer"),
                t = e("./proxyimagecontainer"), l = e("./framecontainer"), s = e("./svgcontainer"),
                u = e("./svgnodecontainer"), a = e("./lineargradientcontainer"), p = e("./webkitgradientcontainer"),
                c = e("./utils").bind;
            f.prototype.findImages = function (e) {
                var n = [];
                return e.reduce(function (e, n) {
                    switch (n.node.nodeName) {
                        case"IMG":
                            return e.concat([{args: [n.node.src], method: "url"}]);
                        case"svg":
                        case"IFRAME":
                            return e.concat([{args: [n.node], method: n.node.nodeName}])
                    }
                    return e
                }, []).forEach(this.addImage(n, this.loadImage), this), n
            }, f.prototype.findBackgroundImage = function (e, n) {
                return n.parseBackgroundImages().filter(this.hasImageBackground).forEach(this.addImage(e, this.loadImage), this), e
            }, f.prototype.addImage = function (e, n) {
                return function (f) {
                    f.args.forEach(function (d) {
                        this.imageExists(e, d) || (e.splice(0, 0, n.call(this, f)), o("Added image #" + e.length, "string" == typeof d ? d.substring(0, 100) : d))
                    }, this)
                }
            }, f.prototype.hasImageBackground = function (e) {
                return "none" !== e.method
            }, f.prototype.loadImage = function (e) {
                if ("url" === e.method) {
                    var n = e.args[0];
                    return !this.isSVG(n) || this.support.svg || this.options.allowTaint ? n.match(/data:image/.*;base64,/i) ? new d(n.replace(/url(['"]{0,}|['"]{0,})$/gi, ""), !1) : this.isSameOrigin(n) || this.options.allowTaint === !0 || this.isSVG(n) ? new d(n, !1) : this.support.cors && !this.options.allowTaint && this.options.useCORS ? new d(n, !0) : this.options.proxy ? new t(n, this.options.proxy) : new i(n) : new s(n)
                }
                return "linear-gradient" === e.method ? new a(e) : "gradient" === e.method ? new p(e) : "svg" === e.method ? new u(e.args[0], this.support.svg) : "IFRAME" === e.method ? new l(e.args[0], this.isSameOrigin(e.args[0].src), this.options) : new i(e)
            }, f.prototype.isSVG = function (e) {
                return "svg" === e.substring(e.length - 3).toLowerCase() || s.prototype.isInline(e)
            }, f.prototype.imageExists = function (e, n) {
                return e.some(function (e) {
                    return e.src === n
                })
            }, f.prototype.isSameOrigin = function (e) {
                return this.getOrigin(e) === this.origin
            }, f.prototype.getOrigin = function (e) {
                var n = this.link || (this.link = document.createElement("a"));
                return n.href = e, n.href = n.href, n.protocol + n.hostname + n.port
            }, f.prototype.getPromise = function (e) {
                return this.timeout(e, this.options.imageTimeout)["catch"](function () {
                    var n = new i(e.src);
                    return n.promise.then(function (n) {
                        e.image = n
                    })
                })
            }, f.prototype.get = function (e) {
                var n = null;
                return this.images.some(function (f) {
                    return (n = f).src === e
                }) ? n : null
            }, f.prototype.fetch = function (e) {
                return this.images = e.reduce(c(this.findBackgroundImage, this), this.findImages(e)), this.images.forEach(function (e, n) {
                    e.promise.then(function () {
                        o("Succesfully loaded image #" + (n + 1), e)
                    }, function (f) {
                        o("Failed loading image #" + (n + 1), e, f)
                    })
                }), this.ready = Promise.all(this.images.map(this.getPromise, this)), o("Finished searching images"), this
            }, f.prototype.timeout = function (e, n) {
                var f, d = Promise.race([e.promise, new Promise(function (d, i) {
                    f = setTimeout(function () {
                        o("Timed out loading image", e), i(e)
                    }, n)
                })]).then(function (e) {
                    return clearTimeout(f), e
                });
                return d["catch"](function () {
                    clearTimeout(f)
                }), d
            }, n.exports = f
        }, {
            "./dummyimagecontainer": 5,
            "./framecontainer": 8,
            "./imagecontainer": 10,
            "./lineargradientcontainer": 12,
            "./log": 13,
            "./proxyimagecontainer": 17,
            "./svgcontainer": 23,
            "./svgnodecontainer": 24,
            "./utils": 26,
            "./webkitgradientcontainer": 27
        }], 12: [function (e, n) {
            function f(e) {
                o.apply(this, arguments), this.type = o.TYPES.LINEAR;
                var n = f.REGEXP_DIRECTION.test(e.args[0]) || !o.REGEXP_COLORSTOP.test(e.args[0]);
                n ? e.args[0].split(/s+/).reverse().forEach(function (e, n) {
                    switch (e) {
                        case"left":
                            this.x0 = 0, this.x1 = 1;
                            break;
                        case"top":
                            this.y0 = 0, this.y1 = 1;
                            break;
                        case"right":
                            this.x0 = 1, this.x1 = 0;
                            break;
                        case"bottom":
                            this.y0 = 1, this.y1 = 0;
                            break;
                        case"to":
                            var f = this.y0, o = this.x0;
                            this.y0 = this.y1, this.x0 = this.x1, this.x1 = o, this.y1 = f;
                            break;
                        case"center":
                            break;
                        default:
                            var d = .01 * parseFloat(e, 10);
                            if (isNaN(d)) break;
                            0 === n ? (this.y0 = d, this.y1 = 1 - this.y0) : (this.x0 = d, this.x1 = 1 - this.x0)
                    }
                }, this) : (this.y0 = 0, this.y1 = 1), this.colorStops = e.args.slice(n ? 1 : 0).map(function (e) {
                    var n = e.match(o.REGEXP_COLORSTOP), f = +n[2], i = 0 === f ? "%" : n[3];
                    return {color: new d(n[1]), stop: "%" === i ? f / 100 : null}
                }), null === this.colorStops[0].stop && (this.colorStops[0].stop = 0), null === this.colorStops[this.colorStops.length - 1].stop && (this.colorStops[this.colorStops.length - 1].stop = 1), this.colorStops.forEach(function (e, n) {
                    null === e.stop && this.colorStops.slice(n).some(function (f, o) {
                        return null !== f.stop ? (e.stop = (f.stop - this.colorStops[n - 1].stop) / (o + 1) + this.colorStops[n - 1].stop, !0) : !1
                    }, this)
                }, this)
            }

            var o = e("./gradientcontainer"), d = e("./color");
            f.prototype = Object.create(o.prototype), f.REGEXP_DIRECTION = /^s*(?:to|left|right|top|bottom|center|d{1,3}(?:.d+)?%?)(?:s|$)/i, n.exports = f
        }, {"./color": 3, "./gradientcontainer": 9}], 13: [function (e, n) {
            var f = function () {
                f.options.logging && window.console && window.console.log && Function.prototype.bind.call(window.console.log, window.console).apply(window.console, [Date.now() - f.options.start + "ms", "html2canvas:"].concat([].slice.call(arguments, 0)))
            };
            f.options = {logging: !1}, n.exports = f
        }, {}], 14: [function (e, n) {
            function f(e, n) {
                this.node = e, this.parent = n, this.stack = null, this.bounds = null, this.borders = null, this.clip = [], this.backgroundClip = [], this.offsetBounds = null, this.visible = null, this.computedStyles = null, this.colors = {}, this.styles = {}, this.backgroundImages = null, this.transformData = null, this.transformMatrix = null, this.isPseudoElement = !1, this.opacity = null
            }

            function o(e) {
                var n = e.options[e.selectedIndex || 0];
                return n ? n.text || "" : ""
            }

            function d(e) {
                if (e && "matrix" === e[1]) return e[2].split(",").map(function (e) {
                    return parseFloat(e.trim())
                });
                if (e && "matrix3d" === e[1]) {
                    var n = e[2].split(",").map(function (e) {
                        return parseFloat(e.trim())
                    });
                    return [n[0], n[1], n[4], n[5], n[12], n[13]]
                }
            }

            function i(e) {
                return -1 !== e.toString().indexOf("%")
            }

            function t(e) {
                return e.replace("px", "")
            }

            function l(e) {
                return parseFloat(e)
            }

            var s = e("./color"), u = e("./utils"), a = u.getBounds, p = u.parseBackgrounds, c = u.offsetBounds;
            f.prototype.cloneTo = function (e) {
                e.visible = this.visible, e.borders = this.borders, e.bounds = this.bounds, e.clip = this.clip, e.backgroundClip = this.backgroundClip, e.computedStyles = this.computedStyles, e.styles = this.styles, e.backgroundImages = this.backgroundImages, e.opacity = this.opacity
            }, f.prototype.getOpacity = function () {
                return null === this.opacity ? this.opacity = this.cssFloat("opacity") : this.opacity
            }, f.prototype.assignStack = function (e) {
                this.stack = e, e.children.push(this)
            }, f.prototype.isElementVisible = function () {
                return this.node.nodeType === Node.TEXT_NODE ? this.parent.visible : "none" !== this.css("display") && "hidden" !== this.css("visibility") && !this.node.hasAttribute("data-html2canvas-ignore") && ("INPUT" !== this.node.nodeName || "hidden" !== this.node.getAttribute("type"))
            }, f.prototype.css = function (e) {
                return this.computedStyles || (this.computedStyles = this.isPseudoElement ? this.parent.computedStyle(this.before ? ":before" : ":after") : this.computedStyle(null)), this.styles[e] || (this.styles[e] = this.computedStyles[e])
            }, f.prototype.prefixedCss = function (e) {
                var n = ["webkit", "moz", "ms", "o"], f = this.css(e);
                return void 0 === f && n.some(function (n) {
                    return f = this.css(n + e.substr(0, 1).toUpperCase() + e.substr(1)), void 0 !== f
                }, this), void 0 === f ? null : f
            }, f.prototype.computedStyle = function (e) {
                return this.node.ownerDocument.defaultView.getComputedStyle(this.node, e)
            }, f.prototype.cssInt = function (e) {
                var n = parseInt(this.css(e), 10);
                return isNaN(n) ? 0 : n
            }, f.prototype.color = function (e) {
                return this.colors[e] || (this.colors[e] = new s(this.css(e)))
            }, f.prototype.cssFloat = function (e) {
                var n = parseFloat(this.css(e));
                return isNaN(n) ? 0 : n
            }, f.prototype.fontWeight = function () {
                var e = this.css("fontWeight");
                switch (parseInt(e, 10)) {
                    case 401:
                        e = "bold";
                        break;
                    case 400:
                        e = "normal"
                }
                return e
            }, f.prototype.parseClip = function () {
                var e = this.css("clip").match(this.CLIP);
                return e ? {
                    top: parseInt(e[1], 10),
                    right: parseInt(e[2], 10),
                    bottom: parseInt(e[3], 10),
                    left: parseInt(e[4], 10)
                } : null
            }, f.prototype.parseBackgroundImages = function () {
                return this.backgroundImages || (this.backgroundImages = p(this.css("backgroundImage")))
            }, f.prototype.cssList = function (e, n) {
                var f = (this.css(e) || "").split(",");
                return f = f[n || 0] || f[0] || "auto", f = f.trim().split(" "), 1 === f.length && (f = [f[0], i(f[0]) ? "auto" : f[0]]), f
            }, f.prototype.parseBackgroundSize = function (e, n, f) {
                var o, d, t = this.cssList("backgroundSize", f);
                if (i(t[0])) o = e.width * parseFloat(t[0]) / 100; else {
                    if (/contain|cover/.test(t[0])) {
                        var l = e.width / e.height, s = n.width / n.height;
                        return s > l ^ "contain" === t[0] ? { e.height * s, height: e.height} : {
                             e.width,
                            height: e.width / s
                        }
                    }
                    o = parseInt(t[0], 10)
                }
                return d = "auto" === t[0] && "auto" === t[1] ? n.height : "auto" === t[1] ? o / n.width * n.height : i(t[1]) ? e.height * parseFloat(t[1]) / 100 : parseInt(t[1], 10), "auto" === t[0] && (o = d / n.height * n.width), {
                     o,
                    height: d
                }
            }, f.prototype.parseBackgroundPosition = function (e, n, f, o) {
                var d, t, l = this.cssList("backgroundPosition", f);
                return d = i(l[0]) ? (e.width - (o || n).width) * (parseFloat(l[0]) / 100) : parseInt(l[0], 10), t = "auto" === l[1] ? d / n.width * n.height : i(l[1]) ? (e.height - (o || n).height) * parseFloat(l[1]) / 100 : parseInt(l[1], 10), "auto" === l[0] && (d = t / n.height * n.width), {
                    left: d,
                    top: t
                }
            }, f.prototype.parseBackgroundRepeat = function (e) {
                return this.cssList("backgroundRepeat", e)[0]
            }, f.prototype.parseTextShadows = function () {
                var e = this.css("textShadow"), n = [];
                if (e && "none" !== e) for (var f = e.match(this.TEXT_SHADOW_PROPERTY), o = 0; f && o < f.length; o++) {
                    var d = f[o].match(this.TEXT_SHADOW_VALUES);
                    n.push({
                        color: new s(d[0]),
                        offsetX: d[1] ? parseFloat(d[1].replace("px", "")) : 0,
                        offsetY: d[2] ? parseFloat(d[2].replace("px", "")) : 0,
                        blur: d[3] ? d[3].replace("px", "") : 0
                    })
                }
                return n
            }, f.prototype.parseTransform = function () {
                if (!this.transformData) if (this.hasTransform()) {
                    var e = this.parseBounds(), n = this.prefixedCss("transformOrigin").split(" ").map(t).map(l);
                    n[0] += e.left, n[1] += e.top, this.transformData = {origin: n, matrix: this.parseTransformMatrix()}
                } else this.transformData = {origin: [0, 0], matrix: [1, 0, 0, 1, 0, 0]};
                return this.transformData
            }, f.prototype.parseTransformMatrix = function () {
                if (!this.transformMatrix) {
                    var e = this.prefixedCss("transform"), n = e ? d(e.match(this.MATRIX_PROPERTY)) : null;
                    this.transformMatrix = n ? n : [1, 0, 0, 1, 0, 0]
                }
                return this.transformMatrix
            }, f.prototype.parseBounds = function () {
                return this.bounds || (this.bounds = this.hasTransform() ? c(this.node) : a(this.node))
            }, f.prototype.hasTransform = function () {
                return "1,0,0,1,0,0" !== this.parseTransformMatrix().join(",") || this.parent && this.parent.hasTransform()
            }, f.prototype.getValue = function () {
                var e = this.node.value || "";
                return "SELECT" === this.node.tagName ? e = o(this.node) : "password" === this.node.type && (e = Array(e.length + 1).join("•")), 0 === e.length ? this.node.placeholder || "" : e
            }, f.prototype.MATRIX_PROPERTY = /(matrix|matrix3d)((.+))/, f.prototype.TEXT_SHADOW_PROPERTY = /((rgba|rgb)([^)]+)(s-?d+px){0,})/g, f.prototype.TEXT_SHADOW_VALUES = /(-?d+px)|(#.+)|(rgb(.+))|(rgba(.+))/g, f.prototype.CLIP = /^rect((d+)px,? (d+)px,? (d+)px,? (d+)px)$/, n.exports = f
        }, {"./color": 3, "./utils": 26}], 15: [function (e, n) {
            function f(e, n, f, o, d) {
                N("Starting NodeParser"), this.renderer = n, this.options = d, this.range = null, this.support = f, this.renderQueue = [], this.stack = new U(!0, 1, e.ownerDocument, null);
                var i = new P(e, null);
                if (d.background && n.rectangle(0, 0, n.width, n.height, new T(d.background)), e === e.ownerDocument.documentElement) {
                    var t = new P(i.color("backgroundColor").isTransparent() ? e.ownerDocument.body : e.ownerDocument.documentElement, null);
                    n.rectangle(0, 0, n.width, n.height, t.color("backgroundColor"))
                }
                i.visibile = i.isElementVisible(), this.createPseudoHideStyles(e.ownerDocument), this.disableAnimations(e.ownerDocument), this.nodes = I([i].concat(this.getChildren(i)).filter(function (e) {
                    return e.visible = e.isElementVisible()
                }).map(this.getPseudoElements, this)), this.fontMetrics = new S, N("Fetched nodes, total:", this.nodes.length), N("Calculate overflow clips"), this.calculateOverflowClips(), N("Start fetching images"), this.images = o.fetch(this.nodes.filter(A)), this.ready = this.images.ready.then(W(function () {
                    return N("Images loaded, starting parsing"), N("Creating stacking contexts"), this.createStackingContexts(), N("Sorting stacking contexts"), this.sortStackingContexts(this.stack), this.parse(this.stack), N("Render queue created with " + this.renderQueue.length + " items"), new Promise(W(function (e) {
                        d.async ? "function" == typeof d.async ? d.async.call(this, this.renderQueue, e) : this.renderQueue.length > 0 ? (this.renderIndex = 0, this.asyncRenderer(this.renderQueue, e)) : e() : (this.renderQueue.forEach(this.paint, this), e())
                    }, this))
                }, this))
            }

            function o(e) {
                return e.parent && e.parent.clip.length
            }

            function d(e) {
                return e.replace(/(-[a-z])/g, function (e) {
                    return e.toUpperCase().replace("-", "")
                })
            }

            function i() {
            }

            function t(e, n, f, o) {
                return e.map(function (d, i) {
                    if (d.width > 0) {
                        var t = n.left, l = n.top, s = n.width, u = n.height - e[2].width;
                        switch (i) {
                            case 0:
                                u = e[0].width, d.args = a({
                                    c1: [t, l],
                                    c2: [t + s, l],
                                    c3: [t + s - e[1].width, l + u],
                                    c4: [t + e[3].width, l + u]
                                }, o[0], o[1], f.topLeftOuter, f.topLeftInner, f.topRightOuter, f.topRightInner);
                                break;
                            case 1:
                                t = n.left + n.width - e[1].width, s = e[1].width, d.args = a({
                                    c1: [t + s, l],
                                    c2: [t + s, l + u + e[2].width],
                                    c3: [t, l + u],
                                    c4: [t, l + e[0].width]
                                }, o[1], o[2], f.topRightOuter, f.topRightInner, f.bottomRightOuter, f.bottomRightInner);
                                break;
                            case 2:
                                l = l + n.height - e[2].width, u = e[2].width, d.args = a({
                                    c1: [t + s, l + u],
                                    c2: [t, l + u],
                                    c3: [t + e[3].width, l],
                                    c4: [t + s - e[3].width, l]
                                }, o[2], o[3], f.bottomRightOuter, f.bottomRightInner, f.bottomLeftOuter, f.bottomLeftInner);
                                break;
                            case 3:
                                s = e[3].width, d.args = a({
                                    c1: [t, l + u + e[2].width],
                                    c2: [t, l],
                                    c3: [t + s, l + e[0].width],
                                    c4: [t + s, l + u]
                                }, o[3], o[0], f.bottomLeftOuter, f.bottomLeftInner, f.topLeftOuter, f.topLeftInner)
                        }
                    }
                    return d
                })
            }

            function l(e, n, f, o) {
                var d = 4 * ((Math.sqrt(2) - 1) / 3), i = f * d, t = o * d, l = e + f, s = n + o;
                return {
                    topLeft: u({x: e, y: s}, {x: e, y: s - t}, {x: l - i, y: n}, {x: l, y: n}),
                    topRight: u({x: e, y: n}, {x: e + i, y: n}, {x: l, y: s - t}, {x: l, y: s}),
                    bottomRight: u({x: l, y: n}, {x: l, y: n + t}, {x: e + i, y: s}, {x: e, y: s}),
                    bottomLeft: u({x: l, y: s}, {x: l - i, y: s}, {x: e, y: n + t}, {x: e, y: n})
                }
            }

            function s(e, n, f) {
                var o = e.left, d = e.top, i = e.width, t = e.height, s = n[0][0] < i / 2 ? n[0][0] : i / 2,
                    u = n[0][1] < t / 2 ? n[0][1] : t / 2, a = n[1][0] < i / 2 ? n[1][0] : i / 2,
                    p = n[1][1] < t / 2 ? n[1][1] : t / 2, c = n[2][0] < i / 2 ? n[2][0] : i / 2,
                    y = n[2][1] < t / 2 ? n[2][1] : t / 2, m = n[3][0] < i / 2 ? n[3][0] : i / 2,
                    r = n[3][1] < t / 2 ? n[3][1] : t / 2, v = i - a, w = t - y, b = i - c, g = t - r;
                return {
                    topLeftOuter: l(o, d, s, u).topLeft.subdivide(.5),
                    topLeftInner: l(o + f[3].width, d + f[0].width, Math.max(0, s - f[3].width), Math.max(0, u - f[0].width)).topLeft.subdivide(.5),
                    topRightOuter: l(o + v, d, a, p).topRight.subdivide(.5),
                    topRightInner: l(o + Math.min(v, i + f[3].width), d + f[0].width, v > i + f[3].width ? 0 : a - f[3].width, p - f[0].width).topRight.subdivide(.5),
                    bottomRightOuter: l(o + b, d + w, c, y).bottomRight.subdivide(.5),
                    bottomRightInner: l(o + Math.min(b, i - f[3].width), d + Math.min(w, t + f[0].width), Math.max(0, c - f[1].width), y - f[2].width).bottomRight.subdivide(.5),
                    bottomLeftOuter: l(o, d + g, m, r).bottomLeft.subdivide(.5),
                    bottomLeftInner: l(o + f[3].width, d + g, Math.max(0, m - f[3].width), r - f[2].width).bottomLeft.subdivide(.5)
                }
            }

            function u(e, n, f, o) {
                var d = function (e, n, f) {
                    return {x: e.x + (n.x - e.x) * f, y: e.y + (n.y - e.y) * f}
                };
                return {
                    start: e, startControl: n, endControl: f, end: o, subdivide: function (i) {
                        var t = d(e, n, i), l = d(n, f, i), s = d(f, o, i), a = d(t, l, i), p = d(l, s, i),
                            c = d(a, p, i);
                        return [u(e, t, a, c), u(c, p, s, o)]
                    }, curveTo: function (e) {
                        e.push(["bezierCurve", n.x, n.y, f.x, f.y, o.x, o.y])
                    }, curveToReversed: function (o) {
                        o.push(["bezierCurve", f.x, f.y, n.x, n.y, e.x, e.y])
                    }
                }
            }

            function a(e, n, f, o, d, i, t) {
                var l = [];
                return n[0] > 0 || n[1] > 0 ? (l.push(["line", o[1].start.x, o[1].start.y]), o[1].curveTo(l)) : l.push(["line", e.c1[0], e.c1[1]]), f[0] > 0 || f[1] > 0 ? (l.push(["line", i[0].start.x, i[0].start.y]), i[0].curveTo(l), l.push(["line", t[0].end.x, t[0].end.y]), t[0].curveToReversed(l)) : (l.push(["line", e.c2[0], e.c2[1]]), l.push(["line", e.c3[0], e.c3[1]])), n[0] > 0 || n[1] > 0 ? (l.push(["line", d[1].end.x, d[1].end.y]), d[1].curveToReversed(l)) : l.push(["line", e.c4[0], e.c4[1]]), l
            }

            function p(e, n, f, o, d, i, t) {
                n[0] > 0 || n[1] > 0 ? (e.push(["line", o[0].start.x, o[0].start.y]), o[0].curveTo(e), o[1].curveTo(e)) : e.push(["line", i, t]), (f[0] > 0 || f[1] > 0) && e.push(["line", d[0].start.x, d[0].start.y])
            }

            function c(e) {
                return e.cssInt("zIndex") < 0
            }

            function y(e) {
                return e.cssInt("zIndex") > 0
            }

            function m(e) {
                return 0 === e.cssInt("zIndex")
            }

            function r(e) {
                return -1 !== ["inline", "inline-block", "inline-table"].indexOf(e.css("display"))
            }

            function v(e) {
                return e instanceof U
            }

            function w(e) {
                return e.node.data.trim().length > 0
            }

            function b(e) {
                return /^(normal|none|0px)$/.test(e.parent.css("letterSpacing"))
            }

            function g(e) {
                return ["TopLeft", "TopRight", "BottomRight", "BottomLeft"].map(function (n) {
                    var f = e.css("border" + n + "Radius"), o = f.split(" ");
                    return o.length <= 1 && (o[1] = o[0]), o.map(F)
                })
            }

            function h(e) {
                return e.nodeType === Node.TEXT_NODE || e.nodeType === Node.ELEMENT_NODE
            }

            function x(e) {
                var n = e.css("position"),
                    f = -1 !== ["absolute", "relative", "fixed"].indexOf(n) ? e.css("zIndex") : "auto";
                return "auto" !== f
            }

            function j(e) {
                return "static" !== e.css("position")
            }

            function k(e) {
                return "none" !== e.css("float")
            }

            function q(e) {
                return -1 !== ["inline-block", "inline-table"].indexOf(e.css("display"))
            }

            function z(e) {
                var n = this;
                return function () {
                    return !e.apply(n, arguments)
                }
            }

            function A(e) {
                return e.node.nodeType === Node.ELEMENT_NODE
            }

            function B(e) {
                return e.isPseudoElement === !0
            }

            function C(e) {
                return e.node.nodeType === Node.TEXT_NODE
            }

            function D(e) {
                return function (n, f) {
                    return n.cssInt("zIndex") + e.indexOf(n) / e.length - (f.cssInt("zIndex") + e.indexOf(f) / e.length)
                }
            }

            function E(e) {
                return e.getOpacity() < 1
            }

            function F(e) {
                return parseInt(e, 10)
            }

            function G(e) {
                return e.width
            }

            function H(e) {
                return e.node.nodeType !== Node.ELEMENT_NODE || -1 === ["SCRIPT", "HEAD", "TITLE", "OBJECT", "BR", "OPTION"].indexOf(e.node.nodeName)
            }

            function I(e) {
                return [].concat.apply([], e)
            }

            function J(e) {
                var n = e.substr(0, 1);
                return n === e.substr(e.length - 1) && n.match(/'|"/) ? e.substr(1, e.length - 2) : e
            }

            function K(e) {
                for (var n, f = [], o = 0, d = !1; e.length;) L(e[o]) === d ? (n = e.splice(0, o), n.length && f.push(O.ucs2.encode(n)), d = !d, o = 0) : o++, o >= e.length && (n = e.splice(0, o), n.length && f.push(O.ucs2.encode(n)));
                return f
            }

            function L(e) {
                return -1 !== [32, 13, 10, 9, 45].indexOf(e)
            }

            function M(e) {
                return /[^u0000-u00ff]/.test(e)
            }

            var N = e("./log"), O = e("punycode"), P = e("./nodecontainer"), Q = e("./textcontainer"),
                R = e("./pseudoelementcontainer"), S = e("./fontmetrics"), T = e("./color"), U = e("./stackingcontext"),
                V = e("./utils"), W = V.bind, X = V.getBounds, Y = V.parseBackgrounds, Z = V.offsetBounds;
            f.prototype.calculateOverflowClips = function () {
                this.nodes.forEach(function (e) {
                    if (A(e)) {
                        B(e) && e.appendToDOM(), e.borders = this.parseBorders(e);
                        var n = "hidden" === e.css("overflow") ? [e.borders.clip] : [], f = e.parseClip();
                        f && -1 !== ["absolute", "fixed"].indexOf(e.css("position")) && n.push([["rect", e.bounds.left + f.left, e.bounds.top + f.top, f.right - f.left, f.bottom - f.top]]), e.clip = o(e) ? e.parent.clip.concat(n) : n, e.backgroundClip = "hidden" !== e.css("overflow") ? e.clip.concat([e.borders.clip]) : e.clip, B(e) && e.cleanDOM()
                    } else C(e) && (e.clip = o(e) ? e.parent.clip : []);
                    B(e) || (e.bounds = null)
                }, this)
            }, f.prototype.asyncRenderer = function (e, n, f) {
                f = f || Date.now(), this.paint(e[this.renderIndex++]), e.length === this.renderIndex ? n() : f + 20 > Date.now() ? this.asyncRenderer(e, n, f) : setTimeout(W(function () {
                    this.asyncRenderer(e, n)
                }, this), 0)
            }, f.prototype.createPseudoHideStyles = function (e) {
                this.createStyles(e, "." + R.prototype.PSEUDO_HIDE_ELEMENT_CLASS_BEFORE + ':before { content: "" !important; display: none !important; }.' + R.prototype.PSEUDO_HIDE_ELEMENT_CLASS_AFTER + ':after { content: "" !important; display: none !important; }')
            }, f.prototype.disableAnimations = function (e) {
                this.createStyles(e, "* { -webkit-animation: none !important; -moz-animation: none !important; -o-animation: none !important; animation: none !important; -webkit-transition: none !important; -moz-transition: none !important; -o-transition: none !important; transition: none !important;}")
            }, f.prototype.createStyles = function (e, n) {
                var f = e.createElement("style");
                f.innerHTML = n, e.body.appendChild(f)
            }, f.prototype.getPseudoElements = function (e) {
                var n = [[e]];
                if (e.node.nodeType === Node.ELEMENT_NODE) {
                    var f = this.getPseudoElement(e, ":before"), o = this.getPseudoElement(e, ":after");
                    f && n.push(f), o && n.push(o)
                }
                return I(n)
            }, f.prototype.getPseudoElement = function (e, n) {
                var f = e.computedStyle(n);
                if (!f || !f.content || "none" === f.content || "-moz-alt-content" === f.content || "none" === f.display) return null;
                for (var o = J(f.content), i = "url" === o.substr(0, 3), t = document.createElement(i ? "img" : "html2canvaspseudoelement"), l = new R(t, e, n), s = f.length - 1; s >= 0; s--) {
                    var u = d(f.item(s));
                    t.style[u] = f[u]
                }
                if (t.className = R.prototype.PSEUDO_HIDE_ELEMENT_CLASS_BEFORE + " " + R.prototype.PSEUDO_HIDE_ELEMENT_CLASS_AFTER, i) return t.src = Y(o)[0].args[0], [l];
                var a = document.createTextNode(o);
                return t.appendChild(a), [l, new Q(a, l)]
            }, f.prototype.getChildren = function (e) {
                return I([].filter.call(e.node.childNodes, h).map(function (n) {
                    var f = [n.nodeType === Node.TEXT_NODE ? new Q(n, e) : new P(n, e)].filter(H);
                    return n.nodeType === Node.ELEMENT_NODE && f.length && "TEXTAREA" !== n.tagName ? f[0].isElementVisible() ? f.concat(this.getChildren(f[0])) : [] : f
                }, this))
            }, f.prototype.newStackingContext = function (e, n) {
                var f = new U(n, e.getOpacity(), e.node, e.parent);
                e.cloneTo(f);
                var o = n ? f.getParentStack(this) : f.parent.stack;
                o.contexts.push(f), e.stack = f
            }, f.prototype.createStackingContexts = function () {
                this.nodes.forEach(function (e) {
                    A(e) && (this.isRootElement(e) || E(e) || x(e) || this.isBodyWithTransparentRoot(e) || e.hasTransform()) ? this.newStackingContext(e, !0) : A(e) && (j(e) && m(e) || q(e) || k(e)) ? this.newStackingContext(e, !1) : e.assignStack(e.parent.stack)
                }, this)
            }, f.prototype.isBodyWithTransparentRoot = function (e) {
                return "BODY" === e.node.nodeName && e.parent.color("backgroundColor").isTransparent()
            }, f.prototype.isRootElement = function (e) {
                return null === e.parent
            }, f.prototype.sortStackingContexts = function (e) {
                e.contexts.sort(D(e.contexts.slice(0))), e.contexts.forEach(this.sortStackingContexts, this)
            }, f.prototype.parseTextBounds = function (e) {
                return function (n, f, o) {
                    if ("none" !== e.parent.css("textDecoration").substr(0, 4) || 0 !== n.trim().length) {
                        if (this.support.rangeBounds && !e.parent.hasTransform()) {
                            var d = o.slice(0, f).join("").length;
                            return this.getRangeBounds(e.node, d, n.length)
                        }
                        if (e.node && "string" == typeof e.node.data) {
                            var i = e.node.splitText(n.length),
                                t = this.getWrapperBounds(e.node, e.parent.hasTransform());
                            return e.node = i, t
                        }
                    } else (!this.support.rangeBounds || e.parent.hasTransform()) && (e.node = e.node.splitText(n.length));
                    return {}
                }
            }, f.prototype.getWrapperBounds = function (e, n) {
                var f = e.ownerDocument.createElement("html2canvaswrapper"), o = e.parentNode, d = e.cloneNode(!0);
                f.appendChild(e.cloneNode(!0)), o.replaceChild(f, e);
                var i = n ? Z(f) : X(f);
                return o.replaceChild(d, f), i
            }, f.prototype.getRangeBounds = function (e, n, f) {
                var o = this.range || (this.range = e.ownerDocument.createRange());
                return o.setStart(e, n), o.setEnd(e, n + f), o.getBoundingClientRect()
            }, f.prototype.parse = function (e) {
                var n = e.contexts.filter(c), f = e.children.filter(A), o = f.filter(z(k)),
                    d = o.filter(z(j)).filter(z(r)), t = f.filter(z(j)).filter(k), l = o.filter(z(j)).filter(r),
                    s = e.contexts.concat(o.filter(j)).filter(m), u = e.children.filter(C).filter(w),
                    a = e.contexts.filter(y);
                n.concat(d).concat(t).concat(l).concat(s).concat(u).concat(a).forEach(function (e) {
                    this.renderQueue.push(e), v(e) && (this.parse(e), this.renderQueue.push(new i))
                }, this)
            }, f.prototype.paint = function (e) {
                try {
                    e instanceof i ? this.renderer.ctx.restore() : C(e) ? (B(e.parent) && e.parent.appendToDOM(), this.paintText(e), B(e.parent) && e.parent.cleanDOM()) : this.paintNode(e)
                } catch (n) {
                    if (N(n), this.options.strict) throw n
                }
            }, f.prototype.paintNode = function (e) {
                v(e) && (this.renderer.setOpacity(e.opacity), this.renderer.ctx.save(), e.hasTransform() && this.renderer.setTransform(e.parseTransform())), "INPUT" === e.node.nodeName && "checkbox" === e.node.type ? this.paintCheckbox(e) : "INPUT" === e.node.nodeName && "radio" === e.node.type ? this.paintRadio(e) : this.paintElement(e)
            }, f.prototype.paintElement = function (e) {
                var n = e.parseBounds();
                this.renderer.clip(e.backgroundClip, function () {
                    this.renderer.renderBackground(e, n, e.borders.borders.map(G))
                }, this), this.renderer.clip(e.clip, function () {
                    this.renderer.renderBorders(e.borders.borders)
                }, this), this.renderer.clip(e.backgroundClip, function () {
                    switch (e.node.nodeName) {
                        case"svg":
                        case"IFRAME":
                            var f = this.images.get(e.node);
                            f ? this.renderer.renderImage(e, n, e.borders, f) : N("Error loading <" + e.node.nodeName + ">", e.node);
                            break;
                        case"IMG":
                            var o = this.images.get(e.node.src);
                            o ? this.renderer.renderImage(e, n, e.borders, o) : N("Error loading <img>", e.node.src);
                            break;
                        case"CANVAS":
                            this.renderer.renderImage(e, n, e.borders, {image: e.node});
                            break;
                        case"SELECT":
                        case"INPUT":
                        case"TEXTAREA":
                            this.paintFormValue(e)
                    }
                }, this)
            }, f.prototype.paintCheckbox = function (e) {
                var n = e.parseBounds(), f = Math.min(n.width, n.height),
                    o = { f - 1, height: f - 1, top: n.top, left: n.left}, d = [3, 3], i = [d, d, d, d],
                    l = [1, 1, 1, 1].map(function (e) {
                        return {color: new T("#A5A5A5"),  e}
                    }), u = s(o, i, l);
                this.renderer.clip(e.backgroundClip, function () {
                    this.renderer.rectangle(o.left + 1, o.top + 1, o.width - 2, o.height - 2, new T("#DEDEDE")), this.renderer.renderBorders(t(l, o, u, i)), e.node.checked && (this.renderer.font(new T("#424242"), "normal", "normal", "bold", f - 3 + "px", "arial"), this.renderer.text("✔", o.left + f / 6, o.top + f - 1))
                }, this)
            }, f.prototype.paintRadio = function (e) {
                var n = e.parseBounds(), f = Math.min(n.width, n.height) - 2;
                this.renderer.clip(e.backgroundClip, function () {
                    this.renderer.circleStroke(n.left + 1, n.top + 1, f, new T("#DEDEDE"), 1, new T("#A5A5A5")), e.node.checked && this.renderer.circle(Math.ceil(n.left + f / 4) + 1, Math.ceil(n.top + f / 4) + 1, Math.floor(f / 2), new T("#424242"))
                }, this)
            }, f.prototype.paintFormValue = function (e) {
                var n = e.getValue();
                if (n.length > 0) {
                    var f = e.node.ownerDocument, o = f.createElement("html2canvaswrapper"),
                        d = ["lineHeight", "textAlign", "fontFamily", "fontWeight", "fontSize", "color", "paddingLeft", "paddingTop", "paddingRight", "paddingBottom", "width", "height", "borderLeftStyle", "borderTopStyle", "borderLeftWidth", "borderTopWidth", "boxSizing", "whiteSpace", "wordWrap"];
                    d.forEach(function (n) {
                        try {
                            o.style[n] = e.css(n)
                        } catch (f) {
                            N("html2canvas: Parse: Exception caught in renderFormValue: " + f.message)
                        }
                    });
                    var i = e.parseBounds();
                    o.style.position = "fixed", o.style.left = i.left + "px", o.style.top = i.top + "px", o.textContent = n, f.body.appendChild(o), this.paintText(new Q(o.firstChild, e)), f.body.removeChild(o)
                }
            }, f.prototype.paintText = function (e) {
                e.applyTextTransform();
                var n = O.ucs2.decode(e.node.data),
                    f = this.options.letterRendering && !b(e) || M(e.node.data) ? n.map(function (e) {
                        return O.ucs2.encode([e])
                    }) : K(n), o = e.parent.fontWeight(), d = e.parent.css("fontSize"), i = e.parent.css("fontFamily"),
                    t = e.parent.parseTextShadows();
                this.renderer.font(e.parent.color("color"), e.parent.css("fontStyle"), e.parent.css("fontVariant"), o, d, i), t.length ? this.renderer.fontShadow(t[0].color, t[0].offsetX, t[0].offsetY, t[0].blur) : this.renderer.clearShadow(), this.renderer.clip(e.parent.clip, function () {
                    f.map(this.parseTextBounds(e), this).forEach(function (n, o) {
                        n && (this.renderer.text(f[o], n.left, n.bottom), this.renderTextDecoration(e.parent, n, this.fontMetrics.getMetrics(i, d)))
                    }, this)
                }, this)
            }, f.prototype.renderTextDecoration = function (e, n, f) {
                switch (e.css("textDecoration").split(" ")[0]) {
                    case"underline":
                        this.renderer.rectangle(n.left, Math.round(n.top + f.baseline + f.lineWidth), n.width, 1, e.color("color"));
                        break;
                    case"overline":
                        this.renderer.rectangle(n.left, Math.round(n.top), n.width, 1, e.color("color"));
                        break;
                    case"line-through":
                        this.renderer.rectangle(n.left, Math.ceil(n.top + f.middle + f.lineWidth), n.width, 1, e.color("color"))
                }
            };
            var $ = {inset: [["darken", .6], ["darken", .1], ["darken", .1], ["darken", .6]]};
            f.prototype.parseBorders = function (e) {
                var n = e.parseBounds(), f = g(e), o = ["Top", "Right", "Bottom", "Left"].map(function (n, f) {
                    var o = e.css("border" + n + "Style"), d = e.color("border" + n + "Color");
                    "inset" === o && d.isBlack() && (d = new T([255, 255, 255, d.a]));
                    var i = $[o] ? $[o][f] : null;
                    return { e.cssInt("border" + n + "Width"), color: i ? d[i[0]](i[1]) : d, args: null}
                }), d = s(n, f, o);
                return {clip: this.parseBackgroundClip(e, d, o, f, n), borders: t(o, n, d, f)}
            }, f.prototype.parseBackgroundClip = function (e, n, f, o, d) {
                var i = e.css("backgroundClip"), t = [];
                switch (i) {
                    case"content-box":
                    case"padding-box":
                        p(t, o[0], o[1], n.topLeftInner, n.topRightInner, d.left + f[3].width, d.top + f[0].width), p(t, o[1], o[2], n.topRightInner, n.bottomRightInner, d.left + d.width - f[1].width, d.top + f[0].width), p(t, o[2], o[3], n.bottomRightInner, n.bottomLeftInner, d.left + d.width - f[1].width, d.top + d.height - f[2].width), p(t, o[3], o[0], n.bottomLeftInner, n.topLeftInner, d.left + f[3].width, d.top + d.height - f[2].width);
                        break;
                    default:
                        p(t, o[0], o[1], n.topLeftOuter, n.topRightOuter, d.left, d.top), p(t, o[1], o[2], n.topRightOuter, n.bottomRightOuter, d.left + d.width, d.top), p(t, o[2], o[3], n.bottomRightOuter, n.bottomLeftOuter, d.left + d.width, d.top + d.height), p(t, o[3], o[0], n.bottomLeftOuter, n.topLeftOuter, d.left, d.top + d.height)
                }
                return t
            }, n.exports = f
        }, {
            "./color": 3,
            "./fontmetrics": 7,
            "./log": 13,
            "./nodecontainer": 14,
            "./pseudoelementcontainer": 18,
            "./stackingcontext": 21,
            "./textcontainer": 25,
            "./utils": 26,
            punycode: 1
        }], 16: [function (e, n, f) {
            function o(e, n, f) {
                var o = "withCredentials" in new XMLHttpRequest;
                if (!n) return Promise.reject("No proxy configured");
                var d = t(o), s = l(n, e, d);
                return o ? a(s) : i(f, s, d).then(function (e) {
                    return m(e.content)
                })
            }

            function d(e, n, f) {
                var o = "crossOrigin" in new Image, d = t(o), s = l(n, e, d);
                return o ? Promise.resolve(s) : i(f, s, d).then(function (e) {
                    return "data:" + e.type + ";base64," + e.content
                })
            }

            function i(e, n, f) {
                return new Promise(function (o, d) {
                    var i = e.createElement("script"), t = function () {
                        delete window.html2canvas.proxy[f], e.body.removeChild(i)
                    };
                    window.html2canvas.proxy[f] = function (e) {
                        t(), o(e)
                    }, i.src = n, i.onerror = function (e) {
                        t(), d(e)
                    }, e.body.appendChild(i)
                })
            }

            function t(e) {
                return e ? "" : "html2canvas_" + Date.now() + "_" + ++r + "_" + Math.round(1e5 * Math.random())
            }

            function l(e, n, f) {
                return e + "?url=" + encodeURIComponent(n) + (f.length ? "&callback=html2canvas.proxy." + f : "")
            }

            function s(e) {
                return function (n) {
                    var f, o = new DOMParser;
                    try {
                        f = o.parseFromString(n, "text/html")
                    } catch (d) {
                        c("DOMParser not supported, falling back to createHTMLDocument"), f = document.implementation.createHTMLDocument("");
                        try {
                            f.open(), f.write(n), f.close()
                        } catch (i) {
                            c("createHTMLDocument write not supported, falling back to document.body.innerHTML"), f.body.innerHTML = n
                        }
                    }
                    var t = f.querySelector("base");
                    if (!t || !t.href.host) {
                        var l = f.createElement("base");
                        l.href = e, f.head.insertBefore(l, f.head.firstChild)
                    }
                    return f
                }
            }

            function u(e, n, f, d, i, t) {
                return new o(e, n, window.document).then(s(e)).then(function (e) {
                    return y(e, f, d, i, t, 0, 0)
                })
            }

            var a = e("./xhr"), p = e("./utils"), c = e("./log"), y = e("./clone"), m = p.decode64, r = 0;
            f.Proxy = o, f.ProxyURL = d, f.loadUrlDocument = u
        }, {"./clone": 2, "./log": 13, "./utils": 26, "./xhr": 28}], 17: [function (e, n) {
            function f(e, n) {
                var f = document.createElement("a");
                f.href = e, e = f.href, this.src = e, this.image = new Image;
                var d = this;
                this.promise = new Promise(function (f, i) {
                    d.image.crossOrigin = "Anonymous", d.image.onload = f, d.image.onerror = i, new o(e, n, document).then(function (e) {
                        d.image.src = e
                    })["catch"](i)
                })
            }

            var o = e("./proxy").ProxyURL;
            n.exports = f
        }, {"./proxy": 16}], 18: [function (e, n) {
            function f(e, n, f) {
                o.call(this, e, n), this.isPseudoElement = !0, this.before = ":before" === f
            }

            var o = e("./nodecontainer");
            f.prototype.cloneTo = function (e) {
                f.prototype.cloneTo.call(this, e), e.isPseudoElement = !0, e.before = this.before
            }, f.prototype = Object.create(o.prototype), f.prototype.appendToDOM = function () {
                this.before ? this.parent.node.insertBefore(this.node, this.parent.node.firstChild) : this.parent.node.appendChild(this.node), this.parent.node.className += " " + this.getHideClass()
            }, f.prototype.cleanDOM = function () {
                this.node.parentNode.removeChild(this.node), this.parent.node.className = this.parent.node.className.replace(this.getHideClass(), "")
            }, f.prototype.getHideClass = function () {
                return this["PSEUDO_HIDE_ELEMENT_CLASS_" + (this.before ? "BEFORE" : "AFTER")]
            }, f.prototype.PSEUDO_HIDE_ELEMENT_CLASS_BEFORE = "___html2canvas___pseudoelement_before", f.prototype.PSEUDO_HIDE_ELEMENT_CLASS_AFTER = "___html2canvas___pseudoelement_after", n.exports = f
        }, {"./nodecontainer": 14}], 19: [function (e, n) {
            function f(e, n, f, o, d) {
                this.width = e, this.height = n, this.images = f, this.options = o, this.document = d
            }

            var o = e("./log");
            f.prototype.renderImage = function (e, n, f, o) {
                var d = e.cssInt("paddingLeft"), i = e.cssInt("paddingTop"), t = e.cssInt("paddingRight"),
                    l = e.cssInt("paddingBottom"), s = f.borders, u = n.width - (s[1].width + s[3].width + d + t),
                    a = n.height - (s[0].width + s[2].width + i + l);
                this.drawImage(o, 0, 0, o.image.width || u, o.image.height || a, n.left + d + s[3].width, n.top + i + s[0].width, u, a)
            }, f.prototype.renderBackground = function (e, n, f) {
                n.height > 0 && n.width > 0 && (this.renderBackgroundColor(e, n), this.renderBackgroundImage(e, n, f))
            }, f.prototype.renderBackgroundColor = function (e, n) {
                var f = e.color("backgroundColor");
                f.isTransparent() || this.rectangle(n.left, n.top, n.width, n.height, f)
            }, f.prototype.renderBorders = function (e) {
                e.forEach(this.renderBorder, this)
            }, f.prototype.renderBorder = function (e) {
                e.color.isTransparent() || null === e.args || this.drawShape(e.args, e.color)
            }, f.prototype.renderBackgroundImage = function (e, n, f) {
                var d = e.parseBackgroundImages();
                d.reverse().forEach(function (d, i, t) {
                    switch (d.method) {
                        case"url":
                            var l = this.images.get(d.args[0]);
                            l ? this.renderBackgroundRepeating(e, n, l, t.length - (i + 1), f) : o("Error loading background-image", d.args[0]);
                            break;
                        case"linear-gradient":
                        case"gradient":
                            var s = this.images.get(d.value);
                            s ? this.renderBackgroundGradient(s, n, f) : o("Error loading background-image", d.args[0]);
                            break;
                        case"none":
                            break;
                        default:
                            o("Unknown background-image type", d.args[0])
                    }
                }, this)
            }, f.prototype.renderBackgroundRepeating = function (e, n, f, o, d) {
                var i = e.parseBackgroundSize(n, f.image, o), t = e.parseBackgroundPosition(n, f.image, o, i),
                    l = e.parseBackgroundRepeat(o);
                switch (l) {
                    case"repeat-x":
                    case"repeat no-repeat":
                        this.backgroundRepeatShape(f, t, i, n, n.left + d[3], n.top + t.top + d[0], 99999, i.height, d);
                        break;
                    case"repeat-y":
                    case"no-repeat repeat":
                        this.backgroundRepeatShape(f, t, i, n, n.left + t.left + d[3], n.top + d[0], i.width, 99999, d);
                        break;
                    case"no-repeat":
                        this.backgroundRepeatShape(f, t, i, n, n.left + t.left + d[3], n.top + t.top + d[0], i.width, i.height, d);
                        break;
                    default:
                        this.renderBackgroundRepeat(f, t, i, {top: n.top, left: n.left}, d[3], d[0])
                }
            }, n.exports = f
        }, {"./log": 13}], 20: [function (e, n) {
            function f(e, n) {
                d.apply(this, arguments), this.canvas = this.options.canvas || this.document.createElement("canvas"), this.options.canvas || (this.canvas.width = e, this.canvas.height = n), this.ctx = this.canvas.getContext("2d"), this.taintCtx = this.document.createElement("canvas").getContext("2d"), this.ctx.textBaseline = "bottom", this.variables = {}, t("Initialized CanvasRenderer with size", e, "x", n)
            }

            function o(e) {
                return e.length > 0
            }

            var d = e("../renderer"), i = e("../lineargradientcontainer"), t = e("../log");
            f.prototype = Object.create(d.prototype), f.prototype.setFillStyle = function (e) {
                return this.ctx.fillStyle = "object" == typeof e && e.isColor ? e.toString() : e, this.ctx
            }, f.prototype.rectangle = function (e, n, f, o, d) {
                this.setFillStyle(d).fillRect(e, n, f, o)
            }, f.prototype.circle = function (e, n, f, o) {
                this.setFillStyle(o), this.ctx.beginPath(), this.ctx.arc(e + f / 2, n + f / 2, f / 2, 0, 2 * Math.PI, !0), this.ctx.closePath(), this.ctx.fill()
            }, f.prototype.circleStroke = function (e, n, f, o, d, i) {
                this.circle(e, n, f, o), this.ctx.strokeStyle = i.toString(), this.ctx.stroke()
            }, f.prototype.drawShape = function (e, n) {
                this.shape(e), this.setFillStyle(n).fill()
            }, f.prototype.taints = function (e) {
                if (null === e.tainted) {
                    this.taintCtx.drawImage(e.image, 0, 0);
                    try {
                        this.taintCtx.getImageData(0, 0, 1, 1), e.tainted = !1
                    } catch (n) {
                        this.taintCtx = document.createElement("canvas").getContext("2d"), e.tainted = !0
                    }
                }
                return e.tainted
            }, f.prototype.drawImage = function (e, n, f, o, d, i, t, l, s) {
                (!this.taints(e) || this.options.allowTaint) && this.ctx.drawImage(e.image, n, f, o, d, i, t, l, s)
            }, f.prototype.clip = function (e, n, f) {
                this.ctx.save(), e.filter(o).forEach(function (e) {
                    this.shape(e).clip()
                }, this), n.call(f), this.ctx.restore()
            }, f.prototype.shape = function (e) {
                return this.ctx.beginPath(), e.forEach(function (e, n) {
                    "rect" === e[0] ? this.ctx.rect.apply(this.ctx, e.slice(1)) : this.ctx[0 === n ? "moveTo" : e[0] + "To"].apply(this.ctx, e.slice(1))
                }, this), this.ctx.closePath(), this.ctx
            }, f.prototype.font = function (e, n, f, o, d, i) {
                this.setFillStyle(e).font = [n, f, o, d, i].join(" ").split(",")[0]
            }, f.prototype.fontShadow = function (e, n, f, o) {
                this.setVariable("shadowColor", e.toString()).setVariable("shadowOffsetY", n).setVariable("shadowOffsetX", f).setVariable("shadowBlur", o)
            }, f.prototype.clearShadow = function () {
                this.setVariable("shadowColor", "rgba(0,0,0,0)")
            }, f.prototype.setOpacity = function (e) {
                this.ctx.globalAlpha = e
            }, f.prototype.setTransform = function (e) {
                this.ctx.translate(e.origin[0], e.origin[1]), this.ctx.transform.apply(this.ctx, e.matrix), this.ctx.translate(-e.origin[0], -e.origin[1])
            }, f.prototype.setVariable = function (e, n) {
                return this.variables[e] !== n && (this.variables[e] = this.ctx[e] = n), this
            }, f.prototype.text = function (e, n, f) {
                this.ctx.fillText(e, n, f)
            }, f.prototype.backgroundRepeatShape = function (e, n, f, o, d, i, t, l, s) {
                var u = [["line", Math.round(d), Math.round(i)], ["line", Math.round(d + t), Math.round(i)], ["line", Math.round(d + t), Math.round(l + i)], ["line", Math.round(d), Math.round(l + i)]];
                this.clip([u], function () {
                    this.renderBackgroundRepeat(e, n, f, o, s[3], s[0])
                }, this)
            }, f.prototype.renderBackgroundRepeat = function (e, n, f, o, d, i) {
                var t = Math.round(o.left + n.left + d), l = Math.round(o.top + n.top + i);
                this.setFillStyle(this.ctx.createPattern(this.resizeImage(e, f), "repeat")), this.ctx.translate(t, l), this.ctx.fill(), this.ctx.translate(-t, -l)
            }, f.prototype.renderBackgroundGradient = function (e, n) {
                if (e instanceof i) {
                    var f = this.ctx.createLinearGradient(n.left + n.width * e.x0, n.top + n.height * e.y0, n.left + n.width * e.x1, n.top + n.height * e.y1);
                    e.colorStops.forEach(function (e) {
                        f.addColorStop(e.stop, e.color.toString())
                    }), this.rectangle(n.left, n.top, n.width, n.height, f)
                }
            }, f.prototype.resizeImage = function (e, n) {
                var f = e.image;
                if (f.width === n.width && f.height === n.height) return f;
                var o, d = document.createElement("canvas");
                return d.width = n.width, d.height = n.height, o = d.getContext("2d"), o.drawImage(f, 0, 0, f.width, f.height, 0, 0, n.width, n.height), d
            }, n.exports = f
        }, {"../lineargradientcontainer": 12, "../log": 13, "../renderer": 19}], 21: [function (e, n) {
            function f(e, n, f, d) {
                o.call(this, f, d), this.ownStacking = e, this.contexts = [], this.children = [], this.opacity = (this.parent ? this.parent.stack.opacity : 1) * n
            }

            var o = e("./nodecontainer");
            f.prototype = Object.create(o.prototype), f.prototype.getParentStack = function (e) {
                var n = this.parent ? this.parent.stack : null;
                return n ? n.ownStacking ? n : n.getParentStack(e) : e.stack
            }, n.exports = f
        }, {"./nodecontainer": 14}], 22: [function (e, n) {
            function f(e) {
                this.rangeBounds = this.testRangeBounds(e), this.cors = this.testCORS(), this.svg = this.testSVG()
            }

            f.prototype.testRangeBounds = function (e) {
                var n, f, o, d, i = !1;
                return e.createRange && (n = e.createRange(), n.getBoundingClientRect && (f = e.createElement("boundtest"), f.style.height = "123px", f.style.display = "block", e.body.appendChild(f), n.selectNode(f), o = n.getBoundingClientRect(), d = o.height, 123 === d && (i = !0), e.body.removeChild(f))), i
            }, f.prototype.testCORS = function () {
                return "undefined" != typeof (new Image).crossOrigin
            }, f.prototype.testSVG = function () {
                var e = new Image, n = document.createElement("canvas"), f = n.getContext("2d");
                e.src = "data:image/svg+xml,<svg xmlns='http://www.w3.org/2000/svg'></svg>";
                try {
                    f.drawImage(e, 0, 0), n.toDataURL()
                } catch (o) {
                    return !1
                }
                return !0
            }, n.exports = f
        }, {}], 23: [function (e, n) {
            function f(e) {
                this.src = e, this.image = null;
                var n = this;
                this.promise = this.hasFabric().then(function () {
                    return n.isInline(e) ? Promise.resolve(n.inlineFormatting(e)) : o(e)
                }).then(function (e) {
                    return new Promise(function (f) {
                        window.html2canvas.svg.fabric.loadSVGFromString(e, n.createCanvas.call(n, f))
                    })
                })
            }

            var o = e("./xhr"), d = e("./utils").decode64;
            f.prototype.hasFabric = function () {
                return window.html2canvas.svg && window.html2canvas.svg.fabric ? Promise.resolve() : Promise.reject(new Error("html2canvas.svg.js is not loaded, cannot render svg"))
            }, f.prototype.inlineFormatting = function (e) {
                return /^data:image/svg+xml;base64,/.test(e) ? this.decode64(this.removeContentType(e)) : this.removeContentType(e)
            }, f.prototype.removeContentType = function (e) {
                return e.replace(/^data:image/svg+xml(;base64)?,/, "")
            }, f.prototype.isInline = function (e) {
                return /^data:image/svg+xml/i.test(e)
            }, f.prototype.createCanvas = function (e) {
                var n = this;
                return function (f, o) {
                    var d = new window.html2canvas.svg.fabric.StaticCanvas("c");
                    n.image = d.lowerCanvasEl, d.setWidth(o.width).setHeight(o.height).add(window.html2canvas.svg.fabric.util.groupSVGElements(f, o)).renderAll(), e(d.lowerCanvasEl)
                }
            }, f.prototype.decode64 = function (e) {
                return "function" == typeof window.atob ? window.atob(e) : d(e)
            }, n.exports = f
        }, {"./utils": 26, "./xhr": 28}], 24: [function (e, n) {
            function f(e, n) {
                this.src = e, this.image = null;
                var f = this;
                this.promise = n ? new Promise(function (n, o) {
                    f.image = new Image, f.image.onload = n, f.image.onerror = o, f.image.src = "data:image/svg+xml," + (new XMLSerializer).serializeToString(e), f.image.complete === !0 && n(f.image)
                }) : this.hasFabric().then(function () {
                    return new Promise(function (n) {
                        window.html2canvas.svg.fabric.parseSVGDocument(e, f.createCanvas.call(f, n))
                    })
                })
            }

            var o = e("./svgcontainer");
            f.prototype = Object.create(o.prototype), n.exports = f
        }, {"./svgcontainer": 23}], 25: [function (e, n) {
            function f(e, n) {
                d.call(this, e, n)
            }

            function o(e, n, f) {
                return e.length > 0 ? n + f.toUpperCase() : void 0
            }

            var d = e("./nodecontainer");
            f.prototype = Object.create(d.prototype), f.prototype.applyTextTransform = function () {
                this.node.data = this.transform(this.parent.css("textTransform"))
            }, f.prototype.transform = function (e) {
                var n = this.node.data;
                switch (e) {
                    case"lowercase":
                        return n.toLowerCase();
                    case"capitalize":
                        return n.replace(/(^|s|:|-|(|))([a-z])/g, o);
                    case"uppercase":
                        return n.toUpperCase();
                    default:
                        return n
                }
            }, n.exports = f
        }, {"./nodecontainer": 14}], 26: [function (e, n, f) {
            f.smallImage = function () {
                return "data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7"
            }, f.bind = function (e, n) {
                return function () {
                    return e.apply(n, arguments)
                }
            }, f.decode64 = function (e) {
                var n, f, o, d, i, t, l, s, u = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/",
                    a = e.length, p = "";
                for (n = 0; a > n; n += 4) f = u.indexOf(e[n]), o = u.indexOf(e[n + 1]), d = u.indexOf(e[n + 2]), i = u.indexOf(e[n + 3]), t = f << 2 | o >> 4, l = (15 & o) << 4 | d >> 2, s = (3 & d) << 6 | i, p += 64 === d ? String.fromCharCode(t) : 64 === i || -1 === i ? String.fromCharCode(t, l) : String.fromCharCode(t, l, s);
                return p
            }, f.getBounds = function (e) {
                if (e.getBoundingClientRect) {
                    var n = e.getBoundingClientRect(), f = null == e.offsetWidth ? n.width : e.offsetWidth;
                    return {
                        top: n.top,
                        bottom: n.bottom || n.top + n.height,
                        right: n.left + f,
                        left: n.left,
                         f,
                        height: null == e.offsetHeight ? n.height : e.offsetHeight
                    }
                }
                return {}
            }, f.offsetBounds = function (e) {
                var n = e.offsetParent ? f.offsetBounds(e.offsetParent) : {top: 0, left: 0};
                return {
                    top: e.offsetTop + n.top,
                    bottom: e.offsetTop + e.offsetHeight + n.top,
                    right: e.offsetLeft + n.left + e.offsetWidth,
                    left: e.offsetLeft + n.left,
                     e.offsetWidth,
                    height: e.offsetHeight
                }
            }, f.parseBackgrounds = function (e) {
                var n, f, o, d, i, t, l, s = " 
    ", u = [], a = 0, p = 0, c = function () {
                    n && ('"' === f.substr(0, 1) && (f = f.substr(1, f.length - 2)), f && l.push(f), "-" === n.substr(0, 1) && (d = n.indexOf("-", 1) + 1) > 0 && (o = n.substr(0, d), n = n.substr(d)), u.push({
                        prefix: o,
                        method: n.toLowerCase(),
                        value: i,
                        args: l,
                        image: null
                    })), l = [], n = o = f = i = ""
                };
                return l = [], n = o = f = i = "", e.split("").forEach(function (e) {
                    if (!(0 === a && s.indexOf(e) > -1)) {
                        switch (e) {
                            case'"':
                                t ? t === e && (t = null) : t = e;
                                break;
                            case"(":
                                if (t) break;
                                if (0 === a) return a = 1, void (i += e);
                                p++;
                                break;
                            case")":
                                if (t) break;
                                if (1 === a) {
                                    if (0 === p) return a = 0, i += e, void c();
                                    p--
                                }
                                break;
                            case",":
                                if (t) break;
                                if (0 === a) return void c();
                                if (1 === a && 0 === p && !n.match(/^url$/i)) return l.push(f), f = "", void (i += e)
                        }
                        i += e, 0 === a ? n += e : f += e
                    }
                }), c(), u
            }
        }, {}], 27: [function (e, n) {
            function f(e) {
                o.apply(this, arguments), this.type = "linear" === e.args[0] ? o.TYPES.LINEAR : o.TYPES.RADIAL
            }

            var o = e("./gradientcontainer");
            f.prototype = Object.create(o.prototype), n.exports = f
        }, {"./gradientcontainer": 9}], 28: [function (e, n) {
            function f(e) {
                return new Promise(function (n, f) {
                    var o = new XMLHttpRequest;
                    o.open("GET", e), o.onload = function () {
                        200 === o.status ? n(o.responseText) : f(new Error(o.statusText))
                    }, o.onerror = function () {
                        f(new Error("Network Error"))
                    }, o.send()
                })
            }

            n.exports = f
        }, {}]
    }, {}, [4])(4)
});

5.源码

我结合layerUi.js框架做了一个弹窗，动态编辑内容

//显示需要打印的数据 ,参数分别是 医院全称，订单id ,用户姓名 ，二维码图片路径
function showPrintData(hname, oid, time, name, qrurl,sName,fee) {
    //显示信息
    let text = '<div style="text-align: center;padding: 10px">' +
        '<div id="qrMy" style="display: inline-block;text-align: left;background-color: white;">' +
        '<div style="padding: 10px">' +
        '<div>医院名称：' + hname + '</div>' +
        '<div>预约订单id：' + oid + '</div>' +
        '<div>科目：' + sName + '</div>' +
        '<div>预约时间：' + time + '</div>' +
        '<div>挂号金额：' + fee + ' 元</div><hr>' +
        '<div>姓名：' + name + '</div>' +
        '<div style="padding: 10px">' +
        '<img src="' + basePath + qrurl + '" alt="二维码"></div>' +
        '</div></div></div>';
    layer.open({
        type: 1,
        title:"快照预览",
        skin: 'layui-layer-rim', //加上边框
        offset: popupTop + "px",
        area: [popupWidth + 'px', popupHeight + 'px'],
        content: text,
        closeBtn: 0,
        btn: '打印并完成业务',
        yes: function (index, layero) {
            //下载截图
            doLoadQR(name);
            layer.close(index);
        },
    });
    //按钮点击打印即可关闭
    isDoOrderOkOnce = false;
}

 有  id="qrMy" 的div是关键 ，该库将会作用在这个div里面

触发生成快照

//本地下载快照  ，name是文件的部分名称
function doLoadQR(name) {
    //新建一个画布元素
    let canvas2 = document.createElement("canvas");
    //获取该元素区块的本身宽高
    let w = parseInt($('#qrMy').width());
    let h = parseInt($('#qrMy').height());
    // console.log(w+"======"+h);
    //因为直接用默认画布会模糊，因此自定义画布，设置画布尺寸为容器的两倍大小，再将内容放大两倍画上去，
    // 修改偏移量，就可以解决模糊问题
    //画布真实宽高
    canvas2.width = w * 2;
    canvas2.height = h * 2;
    //宽高宽高
    canvas2.style.width = w + "px";
    canvas2.style.height = h + "px";
    //设置画布的内容
    let context = canvas2.getContext("2d");
    //x,y轴放大两倍
    context.scale(2, 2);
    //获取容器边距对象
    let rect = $('#qrMy').get(0).getBoundingClientRect();
    //设置偏移量
    context.translate('-' + rect.left, '-' + rect.top);
    //调用库
    html2canvas(document.querySelector('#qrMy')
        , {
            useCORS: true,
            scale: 2,
             w,
            height: h,
            //使用自定义的画布
            canvas: canvas2,
            // window.devicePixelRatio是设备像素比
            dpi: window.devicePixelRatio * 2,

        }
    ).then(function (canvas) {
        // 回调生成的画布canvas对象
        // 获取生成的图片的相对url，其实将bese64加密的数据 的数据类型image/png换成image/octet-stream
        let imgUri = canvas.toDataURL("image/png")
            .replace("image/png", "image/octet-stream");
        //文件名称
        let filename = (new Date()).getTime() + "_" + name + '.png';
        //下载
        saveFile(imgUri, filename);
    });
}

//

如何自定义本地下载？

其实就是用<a>，模拟点击即可

// * 在本地进行文件保存
// * @param  {String} data     要保存到本地的图片数据/或路径
// * @param  {String} filename 文件名
// */
function saveFile(data, filename) {
    // 创建一个<a>标签
    let save_link = document.createElement('a');
    save_link.href = data;
    save_link.download = filename;
    let event = document.createEvent('MouseEvents');
    event.initMouseEvent('click', true, false, window, 0,
        0, 0, 0, 0, false, false,
        false, false, 0, null);
    save_link.dispatchEvent(event);
}