版权声明：本文为博主原创文章，未经博主允许不得转载。 https://blog.csdn.net/chengqiuming/article/details/86602174
一 基本用法
1 代码
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>下拉菜单</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>2 效果
二 下拉分隔线
1 代码
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>下拉分隔线</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>2 效果
三 菜单标题
1 代码
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜单标题</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation" class="dropdown-header">第一部分菜单头部</li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation" class="dropdown-header">第二部分菜单头部</li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>2 效果
四 对齐方式
1 代码
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>对齐方式</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<h4>使用pull-right类使下拉菜单与父容器右边对齐</h4>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu pull-right" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<br/>
<br/>
<h4>使用dropdown-menu-right类使下拉菜单与父容器右边对齐</h4>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu dropdown-menu-right" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<br/>
<br/>
<h4>下拉菜单与父容器左边对齐</h4>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu dropdown-menu-left" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>2 效果
五 菜单项状态
1 代码
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>菜单项状态</title>
<link rel="stylesheet" href="https://cdn.bootcss.com/bootstrap/3.1.1/css/bootstrap.min.css">
<link rel="stylesheet" href="style.css">
</head>
<body>
<div class="dropdown">
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">
下拉菜单
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation" class="active"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
<li role="presentation" class="divider"></li>
<li role="presentation" class="disabled"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul>
</div>
<script src="https://www.imooc.com/static/lib/jquery/1.9.1/jquery.js"></script>
<script src="//maxcdn.bootstrapcdn.com/bootstrap/3.2.0/js/bootstrap.min.js"></script>
</body>
</html>2 效果
