<!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.min.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>
<div class="btn-group" role="group" aria-label="Button group with nested dropdown">
<button type="button" class="btn btn-secondary">1</button>
<button type="button" class="btn btn-secondary">2</button>
<div class="btn-group" role="group">
<button id="btnGroupDrop1" type="button" class="btn btn-secondary dropdown-toggle" data-toggle="dropdown">
Dropdown
</button>
<div class="dropdown-menu" aria-labelledby="btnGroupDrop1">
<a class="dropdown-item" href="#">Dropdown link</a>
<a class="dropdown-item" href="#">Dropdown link</a>
</div>
</div>
</div>
</body>
</html>
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