ftl:

<!-- Main navigation -->

  <div class="sidebar-category sidebar-category-visible">
   <div class="category-content no-padding">
    <ul class="navigation navigation-main navigation-accordion">

     <!-- Main -->

          <!-- 遍历menuTreeList构造左侧树菜单 -->
                <#if menuTreeList?? && menuTreeList?size gt 0><!-- ??是不为空，gt是大于，html中&gt; -->
               
                 <#list menuTreeList as menu>
                 
    <li>
     <a href="#">
      ${menu.catalogName}
     </a>
     <#if menu.childObj?? && menu.childObj?size gt 0>
               <@subNav subObj = menu.childObj />
     </#if>
          </li>
                  <#--<#list menu?keys as key>
                   <#if menu["children"]?? && menu["children"]?size gt 0>
                    <#list menu["children"] as children>
                     <@subNav subs = menu.children/>
                    </#list>
                   </#if>
                  </#list>-->
                  
                 </#list>
                </#if>

     <!-- /main -->

    </ul>
   </div>
  </div>
  <!-- /main navigation -->

 </div>
</div>

<#-- 自定义递归函数 -->
<#macro subNav subObj>
 <#if subObj ?? && subObj?size gt 0 >
  <ul>
  <#list subObj as obj>
   
   <#if obj.catalogName ?? >
    <li>
     <a href="#">
      ${obj.catalogName}
     </a>
     <#if obj.childObj ??>
               <@subNav subObj = obj.childObj />
     </#if>
   <#elseif obj.menuName ??>
    <li>
     <a onclick="ruizhi.OpenPage('${obj.menuUrl}')">
      ${obj.menuName}

     </a>
   </#if>
   
          </li>
        </#list>

  
        </ul>
    </#if>
</#macro>

html：？？？？？？