zhudai/WebRoot/js/gVerify.js

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!(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: "90", //默认canvas宽度
			height: "36", //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";