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?? ???? ???? ????? JavaScript? ??? ??? ????.
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?? ?? ??? ???? ??????
??(?? ??) ??
?? ??? ???? ??? ??(?? ??) ??? ????? ???? ? ?????. ????? ?? ??? ?? ??? ?? ??? ???? ??? ?? ?? false???. ??? ??? ??? ?? ?? true???(???? ??? ??? ??).
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<head>
<script>
function validateForm(){
var x=document.forms["myForm"]["fname"].value;
if (x==null || x==""){
alert("姓必須填寫");
return false;
}
}
</script>
</head>
<body>
<form name="myForm" action="" onsubmit="return validateForm()" method="post">
姓: <input type="text" name="fname">
<input type="submit" value="提交">
</form>
</body>
</html>?? ????? ???? ??? ???
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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title>php中文網(wǎng)(php.cn)</title>
</head>
<head>
<script>
function validateForm(){
var x=document.forms["myForm"]["email"].value;
var atpos=x.indexOf("@");
var dotpos=x.lastIndexOf(".");
if (atpos<1 || dotpos<atpos+2 || dotpos+2>=x.length){
alert("不是一個有效的 e-mail 地址");
return false;
}
}
</script>
</head>
<body>
<form name="myForm" action="" onsubmit="return validateForm();" method="post">
Email: <input type="text" name="email">
<input type="submit" value="提交">
</form>
</body>
</html>????? ???? ??? ???
