javascript 正则表达式判断IP地址合法性
<html>
<head>
<title>test</title>
<script type="text/javascript">
function checkIP(value){
var pattern = /^/d{1,3}(/./d{1,3}){3}$/;
if (!pattern.exec(value)) {
alert('please input valid ip address');
return false;
}
var ary = value.split('.');
for(key in ary)
{
if (parseInt(ary[key]) > 255){
alert('please input valid ip address');
return false;
}
}
alert('valid ip address');
return true ;
}
</script>
</head>
<body>
<input type="text" name="ip" onchange="checkIP(this.value);"/>
</body>
</html>
<head>
<title>test</title>
<script type="text/javascript">
function checkIP(value){
var pattern = /^/d{1,3}(/./d{1,3}){3}$/;
if (!pattern.exec(value)) {
alert('please input valid ip address');
return false;
}
var ary = value.split('.');
for(key in ary)
{
if (parseInt(ary[key]) > 255){
alert('please input valid ip address');
return false;
}
}
alert('valid ip address');
return true ;
}
</script>
</head>
<body>
<input type="text" name="ip" onchange="checkIP(this.value);"/>
</body>
</html>
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