<!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>