js-驗(yàn)證碼插件gVerify.js?原地址：http://www.cnblogs.com/liaobeifeng/p/7085804.html
源碼：
!(function(window,?document)?{??
function?GVerify(options)?{?//創(chuàng)建一個(gè)圖形驗(yàn)證碼對(duì)象，接收options對(duì)象為參數(shù)??
this.options?=?{?//默認(rèn)options參數(shù)值??
id:"",?//容器Id??
canvasId:"verifyCanvas",?//canvas的ID??
width:"100",?//默認(rèn)canvas寬度??
height:"30",?//默認(rèn)canvas高度??
type:"blend",?//圖形驗(yàn)證碼默認(rèn)類(lèi)型blend:數(shù)字字母混合類(lèi)型、number:純數(shù)字、letter:純字母??
code:""??
????????}??
if(Object.prototype.toString.call(options)?==?"[object?Object]"){//判斷傳入?yún)?shù)類(lèi)型??
for(var?i?in?options)?{?//根據(jù)傳入的參數(shù)，修改默認(rèn)參數(shù)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?=?{??
/**版本號(hào)**/??
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?="您的瀏覽器版本不支持canvas";??
????????????con.appendChild(canvas);??
var?parent?=?this;??
canvas.onclick?=function(){??
????????????????parent.refresh();??
????????????}??
????????},??
/**生成驗(yàn)證碼**/??
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")?{?//判斷驗(yàn)證碼類(lèi)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';?//隨機(jī)生成字體大小??
ctx.fillStyle?=?randomColor(50,?160);//隨機(jī)生成字體顏色??????????
????????????????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);??
/**設(shè)置旋轉(zhuǎn)角度和坐標(biāo)原點(diǎn)**/??
????????????????ctx.translate(x,?y);??
????????????????ctx.rotate(deg?*?Math.PI?/?180);??
????????????????ctx.fillText(txt,?0,?0);??
/**恢復(fù)旋轉(zhuǎn)角度和坐標(biāo)原點(diǎn)**/??
????????????????ctx.rotate(-deg?*?Math.PI?/?180);??
????????????????ctx.translate(-x,?-y);??
????????????}??
/**繪制干擾線**/??
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();??
????????????}??
/**繪制干擾點(diǎn)**/??
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();??
????????????}??
????????},??
/**驗(yàn)證驗(yàn)證碼**/??
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;??
????????????}??
????????}??
????}??
/**生成字母數(shù)組**/??
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(",");??
????}??
/**生成一個(gè)隨機(jī)數(shù)**/??
function?randomNum(min,?max)?{??
return?Math.floor(Math.random()?*?(max?-?min)?+?min);??
????}??
/**生成一個(gè)隨機(jī)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);??
