<!DOCTYPE html>
<html lang="zh-CN">
<head>
<meta charset="utf-8">
<title></title>
<!-- 适应iphone响应式布局 -->
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- 上述3个meta标签*必须*放在最前面，任何其他内容都*必须*跟随其后！ -->
<!-- Bootstrap -->
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<script src="https://cdn.bootcss.com/jquery/1.12.4/jquery.min.js"></script>
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</head>
<body>
<div class="dropdown">
<a href="#" class="btn btn-lg btn-success" data-toggle="dropdown">激活按钮<i class="caret"></i></a>
<ul class="dropdown-menu">
<li><a href="#">菜单项1</a></li>
<li><a href="#">菜单项2</a></li>
<li><a href="#">菜单项3</a></li>
</ul>
</div>
<body>
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