今天看到有百度验证码挺有意思的，就把它仿下来了。
利用JS实现当选择满4个后自动对比，本文中采用静态对比的方法看你是否全部选择对。然后提示【答案正确！】或【答案错误!】，
以后有空再去做成程序，先分享给大家！
效果图如下：
可运行的特效地址：【js仿百度贴吧验证码特效】
源代码如下：
<!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仿百度贴吧验证码特效</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://www.86y.org/upload/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://www.86y.org/upload/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">点击框内文字输入上图中<i>汉字或拼音</i>对应汉字</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); } //获取属性样式 function getStyle(id,prop){ var obj=getid(id); var ie = !+"\v1";//简单判断ie6~8 if(prop=="backgroundPosition"){//IE6~8不兼容backgroundPosition写法，识别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 = ["","","",""];//储存容器 var crent="-56px -92px,-100px -138px,-100px -92px,-3px -138px"; //正确答案容器 var flag=0;//从第0个开始算起到当到第3个时自动对比答案 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("答案正确!"); } else { alert("答案错误!"); dele(); } } } //清除原有值 function dele(){ flag=0; for(var i=0;i<adbs.length;i++) adbs[i].style.cssText=""; anslist = ["","","",""]; } //绑定九宫格验证码的点击事件 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(" ");//属性中间的空间作为分隔符如：background-position:215px 215px; getStyle方法取得值是215px 215px; var st1,st2=""; /*-53px -36px,-56px -41px;经对比九宫格与显示选择的答案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>
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