<!DOCTYPE html>
<html>
<head>
<title>Bootstrap实例</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://apps.bdimg.com/libs/bootstrap/3.3.0/css/bootstrap.min.css">
<script src="https://libs.baidu.com/jquery/2.1.4/jquery.min.js"></script>
<script src="https://apps.bdimg.com/libs/bootstrap/3.3.0/js/bootstrap.min.js"></script>
</head>
<body>
<div class="container">
<h2>Panel Group</h2>
<p>The panel-group class clears the bottom-margin. Try to remove the class and see what happens.</p>
<div class="panel-group">
<div class="panel panel-default">
<div class="panel-heading">Panel Header</div>
<div class="panel-body">Panel Content</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">Panel Header</div>
<div class="panel-body">Panel Content</div>
</div>
<div class="panel panel-default">
<div class="panel-heading">Panel Header</div>
<div class="panel-body">Panel Content</div>
</div>
</div>
</div>
</body>
</html>