<ul class="nav nav-tabs">
    <li class="{{if $tab == 'app'}}active{{/if}}"><a href="{{url('admin/setting/app')}}">系统设置</a></li>
    <li class="{{if $tab == 'safe'}}active{{/if}}"><a href="{{url('admin/setting/safe')}}">安全设置</a></li>
</ul>