• JS 验证码的实现


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

    正要做一个验证码,网上找到这个还不错:

    gVerify.js:

    !(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
    			 "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();
    			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);
    

      

    index.html

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title>图形验证码</title>
        </head>
        <body>
            <div id="v_container" style=" 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:

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  • 原文地址:https://www.cnblogs.com/XT-xutao/p/12047191.html
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