Bootstrap面板默认类
要获得基本面板，只需将类.panel添加到<div>元素中。这样，将.panel-default类添加到此元素，如以下代码所示：
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 = "panel panel-default">
<div class = "panel-body">
This is a demo panel
</div>
</div>
</body>
</html>