<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1,maximum-scale=1,user-scalable=no" />
<!--bootstrap要引入的文件：bootstrap.min.css,jquery.min.js,bootrap.min.js-->
<link rel="stylesheet" type="text/css" href="css/bootstrap.css"/>
<script src="js/jquery-1.11.0.js" type="text/javascript" charset="utf-8"></script>
<!--要在bootstrap之前引入jquery,bootstrap依赖JQUERY,因为bootstrapJS里要使用$这个jquery变量-->
<!--<script src="js/popper.js" type="text/javascript" charset="utf-8"></script>-->
<!--如果你要用bootstrap使用一些提示性的交互，那么就需要引入提示性的框架popper.js,因为bootstrap的提示就是依赖popper-->
<script src="js/bootstrap.js" type="text/javascript" charset="utf-8"></script>
</head>
<body>
<button class="btn btn-warning">
通知 <span class="badge badge-danger">19</span>
<span class="sr-only">这是19条未读信息</span>
</button>
<a href="#" class="badge badge-primary">Primary</a>
<a href="#" class="badge badge-secondary">Secondary</a>
<a href="#" class="badge badge-success">Success</a>
<a href="#" class="badge badge-danger">Danger</a>
<a href="#" class="badge badge-warning">Warning</a>
<a href="#" class="badge badge-info">Info</a>
<a href="#" class="badge badge-light">Light</a>
<a href="#" class="badge badge-dark">Dark</a>
</body>
</html>
