<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">  
    <html xmlns="http://www.w3.org/1999/xhtml">  
    <head>  
    <meta http-equiv="Content-Type" content="text/html; charset=gb2312" />  
    <title>js仿百度貼吧驗證碼特效</title>  
    <style>  
    div{margin:0;padding:0;}  
    .com{width:246px;font-size:12px;padding:12px;border:1px solid #ccc;}  
    .clearfix:after{content:".";display:block;height:0;clear:both;visibility:hidden}.clearfix{zoom:1}  

    .j_captcha_input{border:1px solid #ccc;}  

    .val_add b,.input_show span,.val_input a b{background:url(http://images/20140113213606506.png) no-repeat -500px -500px;}  

    .input_show{height:36px;margin-bottom:5px;}  
    .input_show span{background-position:0 0;display: inline-block;height: 36px;margin-right: 5px;vertical-align: middle;width: 150px;}  

    .val_add{border:1px solid #CCC;word-break: break-all;margin:0 20px 5px 0;}  
    .val_add b{border-right:1px solid #ddd;height: 34px;width: 45px;float:left;}  

    .val_add .delete{background:url(http://images/20140113213531521.png) no-repeat 0 0 #ccc;border-right:0 none;cursor:pointer;width: 40px;}  

    .ation i{font-style:normal;color:#ff0000;}  

    .val_input{width:190px;margin-top:5px;}  
    .val_input a{display:block;float:left;margin:0 5px 5px 0;width:54px;height:40px;border:1px solid #e0e0e0;border-bottom-color:#bfbfbf;outline:0;background:-ms-linear-gradient(top,#fff,#f5f5f5);background:-webkit-gradient(linear,left top,left bottom,from(#fff),to(#f5f5f5));background:-moz-linear-gradient(top,#fff,#fafafa);filter:progid:DXImageTransform.Microsoft.Gradient(gradientType=0,startColorStr=#FFFFFF,endColorStr=#F5F5F5);zoom:1}  

    .val_input a b{width:54px;height:40px;cursor:pointer;zoom:1;display:block;}  

    .val_input #v_0{background-position:0 -36px}  
    .val_input #v_1{background-position:-53px -36px}/*-56px -41px;*/  
    .val_input #v_2{background-position:-97px -36px}  
    .val_input #v_3{background-position:0 -87px}  
    .val_input #v_4{background-position:-53px -87px}  
    .val_input #v_5{background-position:-97px -87px}  
    .val_input #v_6{background-position:0 -133px}  
    .val_input #v_7{background-position:-53px -133px}  
    .val_input #v_8{background-position:-97px -133px}  
    </style>  
    </head>  
    <body>  
    <div class="com">  
      <div class="val_add clearfix" id="val_add">  
          <b></b>  
          <b></b>  
          <b></b>  
          <b></b>  
          <b class="delete" title="清除" onclick="dele();"></b>  
      </div>  
      <div class="input_show"><span></span><a>看不清?</a></div>  
      <div class="ation">點擊框內(nèi)文字輸入上圖中<i>漢字或拼音</i>對應漢字</div>  
      <div class="val_input clearfix" id="val_input">  
          <a href="javascript:;"><b id="v_0"></b></a>  
          <a href="javascript:;"><b id="v_1"></b></a>  
          <a href="javascript:;"><b id="v_2"></b></a>  
          <a href="javascript:;"><b id="v_3"></b></a>  
          <a href="javascript:;"><b id="v_4"></b></a>  
          <a href="javascript:;"><b id="v_5"></b></a>  
          <a href="javascript:;"><b id="v_6"></b></a>  
          <a href="javascript:;"><b id="v_7"></b></a>  
          <a href="javascript:;"><b id="v_8"></b></a>  
      </div>  
    </div>  
    <script>  

    function getid(id) {  
        return document.getElementById(id);  
    }  

    //獲取屬性樣式  
    function getStyle(id,prop){   
        var obj=getid(id);  
        var ie = !+"\v1";//簡單判斷ie6~8  
        if(prop=="backgroundPosition"){//IE6~8不兼容backgroundPosition寫法，識別backgroundPositionX/Y  
            if(ie){       
                return obj.currentStyle.backgroundPositionX +" "+obj.currentStyle.backgroundPositionY;  
            }  
        }  
        if (obj.currentStyle) {  
            return obj.currentStyle[prop];       
        }  
        else if (window.getComputedStyle) {  
            proppropprop = prop.replace (/([A-Z])/g, "-$1");             
            proppropprop = prop.toLowerCase ();       
             return document.defaultView.getComputedStyle (obj,null)[prop];       
        }  
    }  

    var anslist = ["","","",""];//儲存容器  
    var crent="-56px -92px,-100px -138px,-100px -92px,-3px -138px"; //正確答案容器  
    var flag=0;//從第0個開始算起到當?shù)降?個時自動對比答案  
    var adbs=getid("val_add").getElementsByTagName("b");  
    function addans(va){  
        for(var i=0;i<anslist.length;i++)  
        {  
            if(anslist[i]=="")  
            {         
                anslist[i]=va;  
                adbs[i].style.cssText="background-position:"+anslist[i];  
                flag=i;  
                break;  
            }  
        }  
        if(flag==3)  
        {  
            if(anslist==crent)  
            {  
                alert("答案正確!");  
            }  
            else  
            {  
                alert("答案錯誤!");  
                dele();  
            }  
        }  
    }  

    //清除原有值  
    function dele(){  
        flag=0;  
        for(var i=0;i<adbs.length;i++)  
            adbs[i].style.cssText="";  
        anslist = ["","","",""];  
    }  

    //綁定九宮格驗證碼的點擊事件  
    function addEvt(tab,ct,type){  
        var ctab = getid(tab).getElementsByTagName("b");  
        //var cdiv = getid(ct).getElementsByTagName(type);  
        for(var i = 0;i<ctab.length;i++)  
        {   
            ctab[i].onclick =function std(){              
                //alert(this.id);  
                var st=getStyle(this.id,"backgroundPosition");  
                var ststd=st.split(" ");//屬性中間的空間作為分隔符如：background-position:215px 215px; getStyle方法取得值是215px 215px;  
                var st1,st2="";  
                /*-53px -36px,-56px -41px;經(jīng)對比九宮格與顯示選擇的答案x差-3，y差-5*/  
                st1= parseInt(std[0].replace("px"))-3;  
                st2= parseInt(std[1].replace("px"))-5;            
                addans(st1+"px "+st2+"px");  
            }  

        }  
    }  
    addEvt("val_input");  
    </script>  
    </body>  
    </html>