JS achieve verification code

Transfer: https://github.com/ace0109/verifyCode

Attempting to do a verification code, found on the Internet this is not bad:

gVerify.js:

! (function (window, Document) { 
	function GVerify (options) {// create a graphic verification code objects, the object receives as a parameter options 
		this.options = {// default options parameter values 
			id: "", // container Id 
			canvasId : "verifyCanvas", // canvas the ID 
			width: "100", // default canvas width 
			height: "30", // default canvas height 
			type: "blend", // default type pattern codes blend: alphanumeric type, number: pure numbers, letter: pure letter 
			code: "" 
		} 
		
		IF (Object.prototype.toString.call (Options) == "[Object Object]") {// type parameter passed is determined 
			for (var i in options) {// the passed parameter, modify the default parameter values 
				this.options [I] = Options [I]; 
			} 
		} the else { 
			this.options.id = Options; 
		} 
		
		this.options.numArr = "0,1 , 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. 1 = I; 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'; // randomly generated font size 
				ctx.fillStyle = randomColor (50, 160) ; // randomly generated font color		 
				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);
				/ ** set the rotation angle and the coordinates origin ** / 
				ctx.translate (X, Y); 
				ctx.rotate (deg Math.PI * / 180 [); 
				ctx.fillText (TXT, 0, 0); 
				/ ** recovery rotation angle and the coordinate origin ** / 
				CTX .rotate (-deg Math.PI * / 180 [); 
				ctx.translate (the -X-, -Y); 
			} 
			/ ** draw line interference ** / 
			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 (); 
			} 
			/ ** interference plotted point ** / 
			for (var I = 0; i <this.options.width / 4; i ++ ) {
				= randomcolor ctx.fillStyle (0, 255); 
				ctx.beginPath (); 
				ctx.arc (randomNum (0, this.options.width), randomNum (0, this.options.height),. 1, 0, 2 * the Math .PI); 
				ctx.fill (); 
			} 
		}, 
		
		/ verification codes ** ** / 
		validate: function(code){
			var code = code.toLowerCase();
			var v_code this.options.code.toLowerCase = (); 
			IF (code == v_code) { 
				return to true; 
			} {the else 
				the this .Refresh (); 
				return to false; 
			} 
		} 
	} 
	/ ** array to produce the letter ** / 
	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 & lt, S, T, the U-, V, W is, X-, the Y, the Z "; 
		return letterStr.split (", "); 
	} 
	/ ** generate a random number**/
	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);

　　

index.html

<!DOCTYPE html>
<html>
    <head>
        <meta charset="UTF-8">
        <title>图形验证码</title>
    </head>
    <body>
        <div id="v_container" style="width: 200px;height: 50px;"></div>
        <input type="text" id="code_input" value="" placeholder="请输入验证码"/><button id="my_button">验证</button>
    </body>
    <script src="./gVerify.js"></script>
    <script>
        var verifyCode = new GVerify("v_container");

        document.getElementById("my_button").onclick = function(){
            var res = verifyCode.validate(document.getElementById("code_input").value);
            if(res){
                alert("验证正确");
            }else{
                alert("验证码错误");
            }
        }
    </script>
</html>

 

使用这个效果不错：