js+css=html验证码验证

以下 为代码,可以直接运行。

<body onLoad="createCode()">

<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 = 6;//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;ivar charIndex = Math.floor(Math.random()*36);   
        code +=selectChar[charIndex];   
       }    
       if(checkCode)   
       {   
         checkCode.className="code";   
         checkCode.value = code;
         checkCode.blur();   
       }        
     }     
     function validate ()   {   
       var inputCode = document.getElementById("validCode").value;   
       if(inputCode.length <=0)   
       {   
           alert("请输入验证码!");   
       }   
       else if(inputCode.toUpperCase() != code )   
       {   
          alert("验证码输入错误!");   
          createCode();//刷新验证码   
       }   
       else   
       {   
         alert("^-^ OK");   
       }   
 }   

    script>  
    <form  action="#">  
     <input  type="text"   id="validCode" />  
    <input type="text" onClick="createCode()" readonly="readonly" id="checkCode" class="unchanged" style="width: 80px;cursor:pointer"  /><br />  
    <input id="Button1"  onclick="validate();" type="button" value="确定" />    
form>

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