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<HTML>
<HEAD>
<TITLE> 检查是否为IP地址</TITLE>
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<BODY>
<title>IP地址合法性验证js代码 - </title>
请输入IP地址：<input type="text" id="ip">
<input type="button" onclick="checkIP()" value="验证">
</BODY>
</HTML>
<script language="javascript">
function checkIP()
{
obj = document.getElementById("ip").value;
//ip地址
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>
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原文地址：http://www.cnblogs.com/gongyuit/p/5485921.html
