tp模版中的多層循環輸出

菜單輸出示例：（只要遇到多個大括號的情況，內層大括號取消）

 {volist name="menus" id="vo" }
    <li class="">
        <a href="{:url($vo['url'])}"><i class="fa fa-th-large"></i> <span class="nav-label">{$vo.name}</span> <span 		class="fa arrow"></span></a>
        <ul class="nav nav-second-level collapse" id="tabs_nav">
            {if condition="!empty($vo._child)"}
                {volist name="vo._child" id="v" }
                    <li class=""><a href="{:url($v.url)}?id={$v.id}">{$v.name}</a>

                   {if condition="!empty($v._child)"}
                        <ul class="nav nav-third-level">
                                {volist name="v._child" id="c" }
                                    <li class=""><a href="{:url($c.url)}">{$c.name}</a> </li>
                                {/volist}
                        </ul>
                    {/if}


                    </li>
                {/volist}
            {/if}
        </ul>
    </li>
    {/volist}