Bootstrap 下拉菜单（Dropdowns）
本章将重点介绍 Bootstrap 下拉菜单。下拉菜单是可切换的，是以列表格式显示链接的上下文菜单。这可以通过与 下拉菜单（Dropdown） JavaScript 插件 的互动来实现。
如需使用下拉菜单，只需要在 class .dropdown 内加上下拉菜单即可。下面的实例演示了基本的下拉菜单：
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结果如下所示：
选项
对齐
通过向 .dropdown-menu 添加 class .pull-right 来向右对齐下拉菜单。下面的实例演示了这点：
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结果如下所示：
标题
您可以使用 class dropdown-header 向下拉菜单的标签区域添加标题。下面的实例演示了这点：
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结果如下所示：
