<html>
<head>
<title>中国站长天空-网页特效-表单特效-验证IP地址是否合法</title>
<meta http-equiv="content-Type" content="text/html;charset=gb2312">
</head>
<body>
<!--把下面代码加到<body>与</body>之间-->
<script language="javascript">
function checkIP()
{
obj=document.getElementById("ip").value
var exp=/^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;
var reg = obj.match(exp);
if(reg==null)
{
alert("IP地址不合法！");
}
else
{
alert("IP地址合法！");
}
}
</script>
请输入IP地址：<input type="text" id="ip">
<input type="button" onclick="checkIP()" value="验证">
</body>
</html>
<head>
<title>中国站长天空-网页特效-表单特效-验证IP地址是否合法</title>
<meta http-equiv="content-Type" content="text/html;charset=gb2312">
</head>
<body>
<!--把下面代码加到<body>与</body>之间-->
<script language="javascript">
function checkIP()
{
obj=document.getElementById("ip").value
var exp=/^(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])\.(\d{1,2}|1\d\d|2[0-4]\d|25[0-5])$/;
var reg = obj.match(exp);
if(reg==null)
{
alert("IP地址不合法！");
}
else
{
alert("IP地址合法！");
}
}
</script>
请输入IP地址：<input type="text" id="ip">
<input type="button" onclick="checkIP()" value="验证">
</body>
</html>
文章来源：http://www.zzsky.cn/effect/content/870.htm
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