var getGVerify = function (id){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IdcanvasId: "verifyCanvas", //canvas的IDwidth: "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{console.log(options);console.log(Object.prototype.toString.call(options));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');}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 = '20px SimHei';//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/2), randomNum(0, this.options.height/2));ctx.lineTo(randomNum(0, this.options.width/2), 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 verifyCode = code.toLowerCase();var v_code = this.options.code.toLowerCase();if(verifyCode == v_code){return true;}else{return false;}}}/**生成字母数组**/function getAllLetter() {var letterStr = "a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z,A,B,C,D,E,F,G,H,I,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 + ")";}return new GVerify(id);}

var verifyCode = new GVerify(id);

if(verifyCode.validate(inputCode)){return true;
}esle{return false;
}