<html>
<head>
<title>javascript</title>
<script language="javascript">
function validate(f) {
var value = f.email.value;
if(!/^\w+@\w+.\w+$/.test(value)) {
alert("EMAIL 输入格式不正确!");
f.email.focus();
f.email.select();
return false;
}
return true;
}
</script>
</head>
<body>
<form action="" method="post" name="myform" onSubmit="return validate(this)">
EMAIL:<input type="text" name="email">
<input type="submit" value="提交">
</form>
</body>
</html>原文：http://blog.csdn.net/q389281541/article/details/44967283