form可以和表單内得元素分離，form的id和表單元素的form屬性對應
<!DOCTYPE html>
<html>
<head >
<meta charset="UTF-8">
<title>form</title>
</head>
<body>
form可以和表單内得元素分離，form的id和表單元素的form屬性對應
<form id="tt"></form>
<input type="text" form="tt" name="p">
<textarea rows="" cols="" form="tt" name="p2"></textarea>
<input type="submit" form="tt" >
</body>
</html>
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