#### 1.nav nav-tabs nav-justified //加上nav-justified这行样式,导航自适应 ```html <ul class="nav nav-tabs nav-justified"> <li class="active"><a href="#">苹果</a></li> <li><a href="#">小米</a></li> <li><a href="#">华为</a></li> <li><a href="#">中兴</a></li> </ul> ```