下拉菜單的默認(rèn)狀態(tài)有懸浮狀態(tài)：?hover?和焦點狀態(tài)：?focus?

.dropdown-menu > li > a:hover, .dropdown-menu > li > a:focus {
  color: #262626;
  text-decoration: none;
  background-color: #f5f5f5; }

下拉菜單還有當(dāng)前狀態(tài)：?active?和禁用狀態(tài)?disabled?，這兩種狀態(tài)使用方法只需要在對應(yīng)的菜單項上添加對應(yīng)的類名

<div class="dropdown"> 
<button class="btn btn-default dropdown-toggle" type="button" id="dropdownMenu1" data-toggle="dropdown">下拉菜單
<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="#">下拉菜單項</a></li>
    ….
    <li role="presentation" class="disabled"><a role="menuitem" tabindex="-1" href="#">下拉菜單項</a></li>
 </ul> </div>