H5+JS生成验证码，并支持点击刷新，验证码校验

H5+JS生成验证码

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JS代码，拷贝下来复制即可，不说太多，直接上代码

JS代码，拷贝下来复制即可，不说太多，直接上代码
!(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.