话不多说，看以下代码
<html>
<head>
<meta http-equiv="content-type" content="text/html; charset=gb2312">
<title>email检验</title>
</head>
<body>
<script language="javascript">
<!--
function check()
{
if(document.register.email.value.length!=0)
{
if (document.register.email.value.charat(0)=="." ||
document.register.email.value.charat(0)=="@"||
document.register.email.value.indexof('@', 0) == -1 ||
document.register.email.value.indexof('.', 0) == -1 ||
document.register.email.value.lastindexof("@")==document.register.email.value.length-1 ||
document.register.email.value.lastindexof(".")==document.register.email.value.length-1)
{
alert("email的格式不正确！");
document.register.email.focus();
return false;
}
}
else
{
alert("email的不能为空！");
document.register.email.focus();
return false;
}
return false;
}
//-->
</script>
<form name="register" method="post" action onsubmit="return check();">
<p align="center">
email:<input type="text" name="email" size="20">
<input type="submit" value="提交" name="b1">
<input type="reset" value="重填" name="b2">
</p>
</form>
</body>
</html>
