<!DOCTYPE html> <html> <head> <meta charset="UTF-8"> <title>htmltopic</title> <script type="text/javascript" src="http://code.jquery.com/jquery-2.1.1.min.js"></script> <script type="text/javascript" src="https://cdn.bootcss.com/html2canvas/0.5.0-beta3/html2canvas.min.js"></script> <style> * { margin: 0; } .test { 100px; height: 100px; text-align: center; line-height: 100px; background-color: #87CEEB; display: inline-block; vertical-align: top; } canvas { margin-right: 5px; } .down { float: left; margin: 40px 10px; } .down2 { float: left; margin: 40px 30px; } </style> </head> <body> <div class="test">测试</div> <div><a class="down" href="" download="downImg">下载</a> </div> <div><a class="down2" href="" download="downImg">下载2</a></div> <script> //直接选择要截图的dom，就能截图，但是因为canvas的原因，生成的图片模糊 //html2canvas(document.querySelector('div')).then(function(canvas) { // document.body.appendChild(canvas); //}); //创建一个新的canvas var canvas2 = document.createElement("canvas"); let _canvas = document.querySelector('div'); var w = parseInt(window.getComputedStyle(_canvas).width); var h = parseInt(window.getComputedStyle(_canvas).height); //将canvas画布放大若干倍，然后盛放在较小的容器内，就显得不模糊了 canvas2.width = w * 2; canvas2.height = h * 2; canvas2.style.width = w + "px"; canvas2.style.height = h + "px"; //可以按照自己的需求，对context的参数修改,translate指的是偏移量 // var context = canvas.getContext("2d"); // context.translate(0,0); var context = canvas2.getContext("2d"); context.scale(2, 2); html2canvas(document.querySelector('div'), { canvas: canvas2 }).then(function(canvas) { //document.body.appendChild(canvas); //canvas转换成url，然后利用a标签的download属性，直接下载，绕过上传服务器再下载 document.querySelector(".down").setAttribute('href', canvas.toDataURL()); }); </script> <script language="javascript"> //这是另一种写法 $(function () { $(".down2").click(function () { html2canvas($(".test")).then(function (canvas) { var imgUri = canvas.toDataURL("image/png").replace("image/png", "image/octet-stream"); // 获取生成的图片的url window.location.href = imgUri; // 下载图片 }); //html2canvas($('.tongxingzheng_bg'), { // onrendered: function (canvas) { // var data = canvas.toDataURL("image/png");//生成的格式 // //data就是生成的base64码啦 // alert(data); // } //}); }); }); </script> </body> </html>
使用htmnl2canvas：http://html2canvas.hertzen.com/
优化清晰以及问题解决方案：https://segmentfault.com/a/1190000011478657?utm_source=tag-newest
附：插件更改https://segmentfault.com/a/1190000007707209
这里有一个
html2canvas(html2canvasdiv, {
allowTaint : false,
taintTest : false,
onrendered : function(canvas) {
var dataUrl = canvas.toDataURL();
img.src = dataUrl;
}
});
allowTaint : false这个参数
是网友提供的 但是否可行还没去实验