<html>
<head>
<title>Bootstrap 实例 - 警告框（Alert）插件</title>
<link href="https://libs.baidu.com/bootstrap/3.0.3/css/bootstrap.min.css" rel="stylesheet">
<script src="https://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>
<script src="https://libs.baidu.com/bootstrap/3.0.3/js/bootstrap.min.js"></script>
</head>
<body>
<div class="alert alert-warning">
<a href="#" class="close" data-dismiss="alert">
×
</a>
<strong>警告！</strong>您的网络连接有问题。
</div>
</body>
</html>