在线运行代码 - 菜鸟教程

<!DOCTYPE html> 
<html lang="en"> 
<head> 
	<meta charset="utf-8"> 
	<title>基本的警告信息实例</title> 
	<meta name="description" content="Creating basic alerts with Bootstrap. Examples of alerts and errors with Bootstrap"> 
	<link href="bootstrap/twitter-bootstrap-v2/docs/assets/css/bootstrap.css.html" rel="stylesheet"> 
	<style type="text/css">body {
			padding: 50px;
		}
	</style>
</head>
<body>
	
<div class="container">
	<div class="row">
		<div class="span4">
			<div class="alert">
				<a class="close" data-dismiss="alert">×</a>
				<strong>Warning!</strong> Best check yo self, you're not looking too good.
			</div>
		</div>
	</div>
</div>
<script src="bootstrap/twitter-bootstrap-v2/docs/assets/js/jquery.js.html"></script>
<script src="bootstrap/twitter-bootstrap-v2/docs/assets/js/bootstrap-alert.js.html"></script>
	
</body>
</html>
源代码

动行结果
