標籤：http java os io for ar cti 代碼
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>Insert title here</title>
<script type="text/javascript">
var iscommit = false;
function dosubmit(){
if(!iscommit){
iscommit = true;
return true;
}else{
return false;
}
}
</script>
</head>
<body>
<form action="/day07/DoFormServlet" method="post" onsubmit="return dosubmit()">
使用者名稱：<input type="text" name="user"><br>
<input type="submit" value="登入">
</form>
</body>
</html>
//其實用js來防止表單重複提交是防不死的，我可以開啟你的網頁原始碼，然後另存新檔------然後將你的js代碼改掉，再去註冊，就可以重複註冊了，防君子，不防小人，最好就是在服務端來處理
//表單重複提交
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