``` <div class="dropdown"> <button class="btn btn-default dropdown-toggle" data-toggle="dropdown">手機品牌 <span class="caret"></span></button> <ul class="dropdown-menu"> //菜單標題 <li class="dropdown-header">國產手機</li> <li><a href="#">小米</a></li> <li><a href="#">華為</a></li> <li><a href="#">vivio</a></li> <li class="divider"></li> <li class="dropdown-header">外國品牌</li> <li><a href="#">蘋果</a></li> </ul> </div> ```