<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "
http://www.w3
.org/TR/xhtml1/DTD/xhtml1-transitiona
l.dtd">
<html xmlns="
http://www.w3
.org/1999/xhtml">
<head>
<meta
http-equiv="Content-Type" content="text/html; charset=gb2312" />
<
title>JS验证码</
title>
<style type="text/css">
.code
{ BACkground-image:url(code.jpg
); font-family:Arial;
font-style:itali
c; 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);//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()*10
); code +=
SELEctChar[charIndex];
}
// alert(cod
E);
if(
checkCod
E) { checkCode.className="code";
checkCode.value = code;
}
}
function validate ()
{ var inputCode = document.getElementById("input1").value;
if(inputCode.length <
=0)
{ alert("请输入验证码!"
); }
else if(inputCode
!= code )
{ alert("验证码输入错误!"
); createCode(
);//刷新验证码
}
else
{ alert("OK"
); }
}
</script>
</head>
<body onload="createCode()">
<form action="#">
<input type="text" id="input1" />
<input type="text" onclick="createCode()" readonly="readonly" id="
checkCode" class="unchanged" style="width: 80px" /><br />
<input id="Button1" onclick="validate(
);" type="button" value="确定" />
</form>
</body>
</html>