js验证码

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js验证码
完成后：
<html><head><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");checkCode.value = "";var selectChar = new Array(2,3,4,5,6,7,8,9,'A','B','C','D','E','F','G','H','J','K','L','M','N','P','Q','R','S','T','U','V','W','X','Y','Z');for(var i=0;i<codeLength;i++) {   var charIndex = Math.floor(Math.random()*32);   code +=selectChar[charIndex];}if(code.length != codeLength){   createCode();}checkCode.value = code;}function validate () {var inputCode = document.getElementById("input1").value.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();   return false;}else {   alert("OK");   return true;}}</script></head><body onload="createCode();"><input type="text" id="input1" /><input type="text" id="checkCode" class="code" style="width: 55px" /> <a href="#" onclick="createCode()">看不清楚</a><br /><br /><center><input id="Button1" onclick="validate();" type="button" value="确定" /></center><script></script></body></html>