Bootstrap 折叠插件隐藏内容

编辑代码
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <link rel="stylesheet" href="http://apps.bdimg.com/libs/bootstrap/3.2.0/css/bootstrap.min.css">
  </head>

  <body>
    <div class="container">
      <h2>Simple Collapsible</h2>
      <button type="button" class="btn btn-info" data-toggle="collapse" data-target="#demo">简单的折叠</button>
      <div id="demo" class="collapse">
        Lorem ipsum dolor sit amet, consectetur adipisicing elit,
        sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam,
        quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat.
      </div>
    </div>

    <script src="http://apps.bdimg.com/libs/jquery/2.1.1/jquery.min.js"></script>
    <script src="http://apps.bdimg.com/libs/bootstrap/3.2.0/js/bootstrap.min.js"></script>
  </body>
</html>