Bootstrap可折叠面板
要在Bootstrap中创建可折叠面板，请使用panel-collapse类。
您可以尝试运行以下代码来创建可折叠面板
示例
<!DOCTYPE html>
<html>
<head>
<title>Bootstrap Example</title>
<link href = "/bootstrap/css/bootstrap.min.css" rel = "stylesheet">
<script src = "/scripts/jquery.min.js"></script>
<script src = "/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div class = "container">
<h2>Tutorials</h2>
<p>Click below...</p>
<div class = "panel-group">
<div class = "panel panel-default">
<div class = "panel-heading">
<h4 class = "panel-title">
<a data-toggle = "collapse" href = "#test">Free learning content</a>
</h4>
</div>
<div id = "test" class = "panel-collapse collapse">
<div class = "panel-body">We provide free learning content and quizzes as well.</div>
<div class = "panel-footer">Copyright 2018</div>
</div>
</div>
</div>
</div>
</body>
</html>