ulthon_information/view/admin/common/left_file.html

<div class="layui-side layui-bg-black">
    <div class="layui-side-scroll">
        <!-- 左侧导航区域（可配合layui已有的垂直导航） -->
        <ul class="layui-nav layui-nav-tree" lay-filter="test">
            <li class="layui-nav-item layui-nav-itemed">
                <a class="" href="javascript:;">文件管理</a>
                <dl class="layui-nav-child">
                    {volist name=":config('upload_type')" id="vo"}    
                    <dd class="left-nav-item" data-name="index-{$key}"><a href="{:url('File/index',['type'=>$key])}">{$vo}</a></dd>
                    {/volist}
                </dl>
            </li>
        </ul>
    </div>
</div>