JavaScript编写的验证码程序

来源：互联网发布：han眼镜怎么样知乎编辑：程序博客网时间：2024/05/20 18:46

<!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>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style type="text/css">
.code{
background-color:#33FF66;
font-family:Arial;
font-style:italic;
color:Red;
border:0;
padding:2px 3px;
letter-spacing:3px;
font-weight:bolder
}
</style>
<script type="text/javascript">
var code;
function createCode()
{
code="";
var codeLength=4;
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','I','J','K','L','M','N','O','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 />
<input type="button" id="Button1" onclick="validate()" value="确定" />
</body>

</html>

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