• js 自动生成的图形数字验证码(前端)


    html:

    <div id="v_container" style=" 140px;height: 36px;margin-left: 10px;"></div>

    js的具体操作:

    $(function () {
    // 定义:存储验证码
    var verifyCode = new GVerify("v_container");
    // 登录的js验证
    $("#login").click(function () {
    var res = verifyCode.validate(document.getElementById("yanzheng").value); //获取验证码

    // 判断:输入框里验证码和获取到的验证码是否一致
    if (res) { //如果一样就验证成功
            console.log(验证成功的操作;)
            }else if (res.length <1){   //验证码输入的长度=等于0,就提示验证码错误
            console.log(验证码错误的操作;)
            verifyCode();  //重新刷新验证码
                return false;

    } else { //如不一致,就验证错误
            console.log(验证码错误的操作;)
            verifyCode();  //重新刷新验证码
                return false;
    }
    });

    });

    js自动生成图形验证码:

    // 生成图形验证码的JS文件
    !(function(window, document) {
    function GVerify(options) { //创建一个图形验证码对象,接收options对象为参数
    this.options = { //默认options参数值
    id: "", //容器Id
    canvasId: "verifyCanvas", //canvas的ID
    "100", //默认canvas宽度
    height: "30", //默认canvas高度
    type: "blend", //图形验证码默认类型blend:数字字母混合类型、number:纯数字、letter:纯字母
    code: ""
    };

    if(Object.prototype.toString.call(options) == "[object Object]"){//判断传入参数类型
    for(var i in options) { //根据传入的参数,修改默认参数值
    this.options[i] = options[i];
    }
    }else{
    this.options.id = options;
    }

    this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");
    this.options.letterArr = getAllLetter();

    this._init();
    this.refresh();
    }

    GVerify.prototype = {
    /**版本号**/
    version: '1.0.0',

    /**初始化方法**/
    _init: function() {
    var con = document.getElementById(this.options.id);
    var canvas = document.createElement("canvas");
    this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "100";
    this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "30";
    canvas.id = this.options.canvasId;
    canvas.width = this.options.width;
    canvas.height = this.options.height;
    canvas.style.cursor = "pointer";
    canvas.innerHTML = "您的浏览器版本不支持canvas";
    con.appendChild(canvas);
    var parent = this;
    canvas.onclick = function(){
    parent.refresh();
    }
    },

    /**生成验证码**/
    refresh: function() {
    this.options.code = "";
    var canvas = document.getElementById(this.options.canvasId);
    if(canvas.getContext) {
    var ctx = canvas.getContext('2d');
    }else{
    return;
    }

    ctx.textBaseline = "middle";

    ctx.fillStyle = randomColor(180, 240);
    ctx.fillRect(0, 0, this.options.width, this.options.height);

    if(this.options.type == "blend") { //判断验证码类型
    var txtArr = this.options.numArr.concat(this.options.letterArr);
    } else if(this.options.type == "number") {
    var txtArr = this.options.numArr;
    } else {
    var txtArr = this.options.letterArr;
    }

    for(var i = 1; i <= 4; i++) {
    var txt = txtArr[randomNum(0, txtArr.length)];
    this.options.code += txt;
    ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机生成字体大小
    ctx.fillStyle = randomColor(50, 160); //随机生成字体颜色
    ctx.shadowOffsetX = randomNum(-3, 3);
    ctx.shadowOffsetY = randomNum(-3, 3);
    ctx.shadowBlur = randomNum(-3, 3);
    ctx.shadowColor = "rgba(0, 0, 0, 0.3)";
    var x = this.options.width / 5 * i;
    var y = this.options.height / 2;
    var deg = randomNum(-30, 30);
    /**设置旋转角度和坐标原点**/
    ctx.translate(x, y);
    ctx.rotate(deg * Math.PI / 180);
    ctx.fillText(txt, 0, 0);
    /**恢复旋转角度和坐标原点**/
    ctx.rotate(-deg * Math.PI / 180);
    ctx.translate(-x, -y);
    }
    /**绘制干扰线**/
    for(var i = 0; i < 4; i++) {
    ctx.strokeStyle = randomColor(40, 180);
    ctx.beginPath();
    ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
    ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
    ctx.stroke();
    }
    /**绘制干扰点**/
    for(var i = 0; i < this.options.width/4; i++) {
    ctx.fillStyle = randomColor(0, 255);
    ctx.beginPath();
    ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);
    ctx.fill();
    }
    },

    /**验证验证码**/
    validate: function(code){
    var code = code.toLowerCase();
    var v_code = this.options.code.toLowerCase();
    if(code == v_code){
    return true;
    }else{
    this.refresh();
    return false;
    }
    }
    };
    /**生成字母数组**/
    function getAllLetter() {
    var letterStr = "a,b,c,d,e,f,g,h,i,j,k,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,J,K,L,M,N,O,P,Q,R,S,T,U,V,W,X,Y,Z";
    return letterStr.split(",");
    }
    /**生成一个随机数**/
    function randomNum(min, max) {
    return Math.floor(Math.random() * (max - min) + min);
    }
    /**生成一个随机色**/
    function randomColor(min, max) {
    var r = randomNum(min, max);
    var g = randomNum(min, max);
    var b = randomNum(min, max);
    return "rgb(" + r + "," + g + "," + b + ")";
    }
    window.GVerify = GVerify;
    })(window, document);
     
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  • 原文地址:https://www.cnblogs.com/lxy1023-/p/9952259.html
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