<ul class="nav sidebar-menu">

                    <!--Dashboard-->

                    <!-- 定义遍历方法 -->

     <#macro bpTree children>

        <#if children?? && children?size gt 0> <!-- 判断是否为空，并且长度是否大于0 -->

            <!-- 不为空 开始遍历 -->

            <#list children as child>

            <#if child.nodes?? && child.nodes?size gt 0>

                <!-- 如果是拥有子节点 -->

                <li><a href="#" class="menu-dropdown"> <i

                class="menu-icon ${child.icon!''}"></i> <span class="menu-text">

                    ${child.title!''} </span> <i class="menu-expand"></i>

                    </a>

                  <ul class="submenu">

                    <@bpTree children=child.nodes />

                  </ul>

                </li>

                <#else>

                <!-- 没有子节点！ -->

                    <li><a href="javascript:void(0)" data-url="${child.url!''}"><i class="menu-icon ${child.icon!''}" ></i><!-- 图标  -->

                    <span class="menu-text"> ${child.title!''} </span></a>

                     </li>

                </#if>

           </#list>

        </#if>

     </#macro>

     <@bpTree children=treeMenu /> <!-- 调用方法 -->

                </ul>