<!DOCTYPE HTML>
<html>
<body>
<form action="/example/demo_form.aspx" method="post">
First name: <input type="text" name="fname" /><br />
<button type="submit" >提交</button>
<button type="submit" formenctype="multipart/form-data">以 Multipart/form-data 类型提交</button>
</form>
</body>
</html>