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話不多說，看以下代碼
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>EMAIL檢驗</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的格式不正確！");
document.register.email.focus();
return false;
}
}
else
{
alert("Email的不可為空！");
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>
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