Bootstrap 下拉菜单之菜单状态
下拉菜单的默认状态有悬浮状态：hover和焦点状态：focus
.dropdown-menu > li > a:hover, .dropdown-menu > li > a:focus {
color: #262626;
text-decoration: none;
background-color: #f5f5f5; }下拉菜单还有当前状态：active和禁用状态disabled，这两种状态使用方法只需要在对应的菜单项上添加对应的类名
<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" class="disabled"><a role="menuitem" tabindex="-1" href="#">下拉菜单项</a></li>
</ul> </div>