JS验证码

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<PRE class=js name="code"><!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>    <title>无标题页</title>    <style type="text/css">        .code        {            background-image:url(code.jpg);            font-family:Arial;            font-style:italic;            color:Red;            border:0;            padding:2px 3px;            letter-spacing:3px;            font-weight:bolder;        }        .unchanged        {            border:0;        }    </style>    <script language="javascript" type="text/javascript">var code ; //在全局 定义验证码function createCode(){ code = "";var codeLength = 4;//验证码的长度var checkCode = document.getElementById("checkCode");var selectChar = new Array(0,1,2,3,4,5,6,7,8,9,'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');//所有候选组成验证码的字符，当然也可以用中文的for(var i=0;i<codeLength;i++){var charIndex = Math.floor(Math.random()*36);code +=selectChar[charIndex];   }if(checkCode){checkCode.className="code";checkCode.value = code;}   } function validate (flag){var inputCode = document.getElementById("input1").value;//不区分大小写if(flag==1){inputCode = inputCode.toUpperCase();}if(inputCode.length <=0){alert("请输入验证码！");return false;}else if(inputCode != code ){alert("验证码输入错误！");createCode();//刷新验证码return false;}else{alert("OK");return true;}   }        </script></head><body onload="createCode()"><form  action="" method="post">    <input  type="text"   id="input1" name="input1"/>    <input type="text" onclick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px"  />    <input id="Button1"  onclick="return validate(1);" type="button" value="确定" /> </form></body></html></PRE>