用Canvas画的验证码,效果图如下
1.验证码的JS代码,保存到一个名称是validatedCode.js的文件内,代码如下:
(function(window,document){ function ValidatedCode(options){ this.options = { id:"", //容器的ID canvasId:"verifyCanvas",//CANVAS的ID 100, height:30, type:"blend", background:"", code:"", interferingLine:true, interferingPoint:true } if(Object.prototype.toString.call(options)=="[object Object]") { //判断传入的参数类型 //如果传入的是对象则修改默认值 for(field in options) { this.options[field]=options[field]; } } else { this.options.id = options; } this.options.numberArray = "1,2,3,4,5,6,7,8,9,0".split(","); this.options.letterArray = "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".split(","); this.init(); this.refresh(); } ValidatedCode.prototype = { varsion:"1.0.0", //版本号 init:function(){ var container = document.getElementById(this.options.id); var canvas = document.createElement("canvas"); canvas.id = this.options.canvasId; canvas.width = this.options.width; canvas.height = this.options.height; canvas.style.cursor="pointer"; canvas.innerHTML="您的浏览器不支持CANVAS"; canvas.style.boxShadow="0 0 10px 2px rgba(0,0,0,.36)"; container.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"; if(this.options.background!='') { ctx.fillStyle=this.options.background; } else { ctx.fillStyle=randomColor(180, 240); } ctx.fillRect(0, 0, this.options.width, this.options.height); var textArray = this.options.numberArray; if(this.options.type=="blend") { textArray.concat(this.options.letterArray); } else if(this.options.type=="letter") { textArray = this.options.letterArray; } for(var i=1;i<5;i++) { var code = textArray[randomNum(0, textArray.length)]; this.options.code+=code; 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(code, 0, 0); /**恢复旋转角度和坐标原点**/ ctx.rotate(-deg * Math.PI / 180); ctx.translate(-x, -y); } if(this.options.interferingLine) { /**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(); } } if(this.options.interferingPoint) { /**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){ code = code.toLowerCase(); var v_code = this.options.code.toLowerCase(); if(code == v_code){ return true; }else{ this.refresh(); return false; } } } /**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.ValidatedCode = ValidatedCode; })(window,document);
2.HTML代码
<!doctype html> <html lang="en"> <head> <meta charset="UTF-8"> <meta name="viewport" content="width=device-width, initial-scale=1.0"> <meta http-equiv="X-UA-Compatible" content="ie=edge"> <title>Document</title> <script type="text/javascript" src="validateCode.js"></script> </head> <body> <div id="validatedCode"></div> <div> <input type="text" id="code" style="180px;height:25px;border-radius: 5px;border:1px solid #ccc;" /> <input type="button" value="验证" onclick="validate()" /> </div> <script type="text/javascript"> var validatedCode = new ValidatedCode({id:"validatedCode",120,type:"blend",interferingLine:false,interferingPoint:false,background:"#fff"}); function validate(){ var code = document.getElementById("code").value; if(validatedCode.validate(code)) { alert("正确"); } else { alert("错误"); } } </script> </body> </html>
本验证码参考自:https://github.com/ace0109/verifyCode
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