le" nv-event="click">
        <!--二级导航效果一-->
        <li class="nv-nav-item nv-nav-show">
            <div class="nv-nav-subtitle">
                <i class="nvicon-classify-empty"></i><span class="nv-nav-subset-title">dashboard</span>
                <i class="nvicon-arrow-down"></i>
            </div>
            <!--一级菜单-->
            <ul class="nv-nav-menu nv-nav-show">
                <li class="nv-nav-item nv-nav-selected">
                    <!--可以使用 <a> 标签-->
    