<!DOCTYPE html>
<html>
<head>
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://www.w3schools.cn/lib/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.2.1.min.js"></script>
<script src="https://www.w3schools.cn/lib/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>文件夹打开字形</h2>
<p>文件夹打开图标：<span class="glyphicon glyphicon-folder-open"></span></p>
<p>作为链接的文件夹打开图标：
<a href="#">
<span class="glyphicon glyphicon-folder-open"></span>
</a>
</p>
<p>按钮上的文件夹打开图标：
<button type="button" class="btn btn-default btn-sm">
<span class="glyphicon glyphicon-folder-open"></span> 文件夹
</button>
</p>
<p>样式链接按钮上的文件夹打开图标：
<a href="#" class="btn btn-info btn-lg">
<span class="glyphicon glyphicon-folder-open"></span> 文件夹
</a>
</p>
<p>Unicode:
<span class="glyphicon"></span>
</p>
</div>
</body>
</html>