下拉菜单点不开
谁能帮我看下为什么下拉菜单点不开？要吐血了
<li role="presentation" class="dropdown"> <a class="dropdown-toggle" data-toggle="dropdown" id="dropdownMenu1" href="#">功能 <span class="caret"></span> </a> <ul class="dropdown-menu" role="menu" aria-labelledby="dropdownMenu1"> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Action</a></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Another action</a></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Something else here</a></li> <li role="presentation"><a role="menuitem" tabindex="-1" href="#">Separated link</a></li> </ul> </li>
