<!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>
</head>
<body>
<div id="vCodeImg" style="width: 100px"></div>
</body>
<script>
(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
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.shadowOffsetX = randomNum(-3,3);
ctx.shadowOffsetY = randomNum(-3,3);
ctx.shadowBlur = randomNum(-3,3);
ctx.shadowColor = "rgba(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);
/**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.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.height),1,2 * Math.PI);
ctx.fill();
}
},
/**验证验证码**/
validate: function(code) {
var code = code.toLowerCase();
var v_code = this.options.code.toLowerCase();
console.log(v_code);
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(",");
}
function randomNum(min,max) {
return Math.floor(Math.random() * (max - min) + min);
}
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);
// 调用GVerifty
var verifyCode = new GVerify("vCodeImg");
</script>
</html>
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