text: !(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
              width: "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();
              console.log(v_code);
              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,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 + ")";
      }
      window.GVerify = GVerify;
  })(window, document);
  
  
  
  
  
  