上传文件：<input type="file">
隐藏字段：<input type="hidden" name="" id="" value="带给后端的信息">
禁用disabled：<button disabled="disabled">注册</button>
只读readonly： <input type="text" readonly value="只读">
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=\, initial-scale=1.0">
<title>上传文件</title>
</head>
<body>
<div>
<div>请上传文件</div>
<div>
<!-- 上传文件 -->
<input type="file" name="">
</div>
</div>
<div>
<div>图片按钮-代替提交按钮样式（input type="submit"）</div>
<form action="">
<!-- 上传文件 -->
<input type="image" src="OIP-C.jpg" >
</form>
</div>
<div>
<div>隐藏按钮</div>
<input type="hidden" name="" id="" value="带给后端的信息">
</div>
<div>
<div>禁用disabled，只读readonly</div>
<div>
<button disabled="disabled">注册</button>
<br>
<input type="radio" disabled>不满意
<br>
<input type="text" disabled value="11111111">
<input type="text" readonly value="只读">
</div>
</div>
</body>
</html>
