140 lines
4.3 KiB
JavaScript
140 lines
4.3 KiB
JavaScript
!(function(window, document) {
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function GVerify(options) { //创建一个图形验证码对象，接收options对象为参数
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this.options = { //默认options参数值
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id: "", //容器Id
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canvasId: "verifyCanvas", //canvas的ID
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width: "200", //默认canvas宽度
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height: "50", //默认canvas高度
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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
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code: ""
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}
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if(Object.prototype.toString.call(options) == "[object Object]"){//判断传入参数类型
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for(var i in options) { //根据传入的参数，修改默认参数值
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this.options[i] = options[i];
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}
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}else{
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this.options.id = options;
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}
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this.options.numArr = "0,1,2,3,4,5,6,7,8,9".split(",");
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this.options.letterArr = getAllLetter();
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this._init();
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this.refresh();
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}
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GVerify.prototype = {
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/**版本号**/
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version: '1.0.0',
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/**初始化方法**/
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_init: function() {
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var con = document.getElementById(this.options.id);
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var canvas = document.createElement("canvas");
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this.options.width = con.offsetWidth > 0 ? con.offsetWidth : "200";
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this.options.height = con.offsetHeight > 0 ? con.offsetHeight : "50";
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canvas.id = this.options.canvasId;
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canvas.width = this.options.width;
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canvas.height = this.options.height;
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canvas.style.cursor = "pointer";
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canvas.innerHTML = "您的浏览器版本不支持canvas";
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con.appendChild(canvas);
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var parent = this;
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canvas.onclick = function(){
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parent.refresh();
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}
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},
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/**生成验证码**/
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refresh: function() {
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this.options.code = "";
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var canvas = document.getElementById(this.options.canvasId);
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if(canvas.getContext) {
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var ctx = canvas.getContext('2d');
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}else{
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return;
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}
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ctx.textBaseline = "middle";
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ctx.fillStyle = randomColor(180, 240);
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ctx.fillRect(0, 0, this.options.width, this.options.height);
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if(this.options.type == "blend") { //判断验证码类型
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var txtArr = this.options.numArr.concat(this.options.letterArr);
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} else if(this.options.type == "number") {
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var txtArr = this.options.numArr;
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} else {
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var txtArr = this.options.letterArr;
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}
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for(var i = 1; i <= 4; i++) {
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var txt = txtArr[randomNum(0, txtArr.length)];
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this.options.code += txt;
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ctx.font = randomNum(this.options.height/2, this.options.height) + 'px SimHei'; //随机生成字体大小
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ctx.fillStyle = randomColor(50, 160); //随机生成字体颜色
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ctx.shadowOffsetX = randomNum(-3, 3);
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ctx.shadowOffsetY = randomNum(-3, 3);
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ctx.shadowBlur = randomNum(-3, 3);
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ctx.shadowColor = "rgba(0, 0, 0, 0.3)";
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var x = this.options.width / 5 * i;
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var y = this.options.height / 2;
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var deg = randomNum(-30, 30);
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/**设置旋转角度和坐标原点**/
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ctx.translate(x, y);
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ctx.rotate(deg * Math.PI / 180);
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ctx.fillText(txt, 0, 0);
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/**恢复旋转角度和坐标原点**/
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ctx.rotate(-deg * Math.PI / 180);
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ctx.translate(-x, -y);
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}
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/**绘制干扰线**/
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for(var i = 0; i < 4; i++) {
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ctx.strokeStyle = randomColor(40, 180);
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ctx.beginPath();
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ctx.moveTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
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ctx.lineTo(randomNum(0, this.options.width), randomNum(0, this.options.height));
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ctx.stroke();
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}
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/**绘制干扰点**/
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for(var i = 0; i < this.options.width/4; i++) {
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ctx.fillStyle = randomColor(0, 255);
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ctx.beginPath();
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ctx.arc(randomNum(0, this.options.width), randomNum(0, this.options.height), 1, 0, 2 * Math.PI);
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ctx.fill();
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}
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},
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/**验证验证码**/
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validate: function(code){
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var code = code.toLowerCase();
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var v_code = this.options.code.toLowerCase();
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console.log(v_code);
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if(code == v_code){
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return true;
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}else{
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this.refresh();
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return false;
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}
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}
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}
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/**生成字母数组**/
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function getAllLetter() {
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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";
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return letterStr.split(",");
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}
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/**生成一个随机数**/
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function randomNum(min, max) {
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return Math.floor(Math.random() * (max - min) + min);
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}
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/**生成一个随机色**/
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function randomColor(min, max) {
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var r = randomNum(min, max);
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var g = randomNum(min, max);
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var b = randomNum(min, max);
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return "rgb(" + r + "," + g + "," + b + ")";
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}
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window.GVerify = GVerify;
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})(window, document);
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