<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 實例 - 下拉菜單（Dropdowns）</title>
<link href="/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<script src="/scripts/jquery.min.js"></script>
<script src="/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div class="dropdown">
<button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
data-toggle="dropdown">
主題
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">Java</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">數(shù)據(jù)挖掘</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">
數(shù)據(jù)通信/網(wǎng)絡(luò)
</a>
</li>
<li role="presentation" class="divider"></li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
</li>
</ul>
</div>
</body>
</html>

結(jié)果如下所示：

Bootstrap 下拉菜單選項

Bootstrap 下拉菜單對齊

通過向 .dropdown-menu 添加 class .pull-right 來向右對齊下拉菜單。下面的實例演示了這點：

<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 實例 - 向右對齊下拉菜單</title>
<link href="/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<script src="/scripts/jquery.min.js"></script>
<script src="/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div class="dropdown">
<button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
data-toggle="dropdown">主題
<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="#">Java</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">數(shù)據(jù)挖掘</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">
數(shù)據(jù)通信/網(wǎng)絡(luò)
</a>
</li>
<li role="presentation" class="divider"></li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
</li>
</ul>
</div>
</body>
</html>

結(jié)果如下所示：

Bootstrap 下拉菜單標(biāo)題

您可以使用 class dropdown-header 向下拉菜單的標(biāo)簽區(qū)域添加標(biāo)題。下面的實例演示了這點：

<!DOCTYPE html>
<html>
<head>
<title>Bootstrap 實例 - 下拉菜單標(biāo)題</title>
<link href="/bootstrap/css/bootstrap.min.css" rel="stylesheet">
<script src="/scripts/jquery.min.js"></script>
<script src="/bootstrap/js/bootstrap.min.js"></script>
</head>
<body>
<div class="dropdown">
<button type="button" class="btn dropdown-toggle" id="dropdownMenu1" 
data-toggle="dropdown">
主題
<span class="caret"></span>
</button>
<ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1">
<li role="presentation" class="dropdown-header">下拉菜單標(biāo)題</li>
<li role="presentation" >
<a role="menuitem" tabindex="-1" href="#">Java</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">數(shù)據(jù)挖掘</a>
</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">
數(shù)據(jù)通信/網(wǎng)絡(luò)
</a>
</li>
<li role="presentation" class="divider"></li>
<li role="presentation" class="dropdown-header">下拉菜單標(biāo)題</li>
<li role="presentation">
<a role="menuitem" tabindex="-1" href="#">分離的鏈接</a>
</li>
</ul>
</div>
</body>
</html>

結(jié)果如下所示：