<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http:///TR/xhtml1/DTD/">
<html xmlns="http:///1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>JS verification code</title>
<style type="text/css">
.code
{
background-image:url();
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; //Define verification code globally
function createCode()
{
code = "";
var codeLength = 4;//Length of verification code
var checkCode = ("checkCode");
var selectChar = new Array(0,1,2,3,4,5,6,7,8,9);//All candidates can also be used in Chinese
for(var i=0;i<codeLength;i++)
{
var charIndex = (()*10);
code +=selectChar[charIndex];
}
// alert(code);
if(checkCode)
{
="code";
= code;
}
}
function validate ()
{
var inputCode = ("input1").value;
if( <=0)
{
alert("Please enter the verification code!");
}
else if(inputCode != code )
{
alert("Verification code input error!");
createCode();//Refresh the verification code
}
else
{
alert("OK");
}
}
</script>
</head>
<body onload="createCode()">
<form action="#">
<input type="text" />
<input type="text" onclick="createCode()" readonly="readonly" class="unchanged" style="width: 80px" /><br />
<input onclick="validate();" type="button" value="okay" />
</form>
</body>
</html>