如果你希望让用户上传文件（例如图像，视频，MP3或者PDE）就需要使用文域
<!DOCTYPE html>
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<html>
<head>
<title>TODO supply a title</title>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div>TODO write content</div>
<form action="http://www.example.com/upload.php" method="post">
<p>选择你要上传的文件:</p>
<input type="file" name="user-song" /><br />
<input type="submit" value="Upload" />
</form>
</body>
</html>