``` .navbar .navbar-default/.navbar-inverse .nav .navbar-nav ```  ```html <div class="navbar navbar-default"> <ul class="nav navbar-nav"> <li class="active"><a href="#">小米</a></li> <li><a href="#">苹果</a></li> <li><a href="#">华为</a></li> </ul> </div> ``` navbar-inverse反色导航——背景色为黑色