thinkphp5 volist 嵌套 实现多维数组的table

<tbody>            {volist name='banner' id='vo' key='i'}                <tr>                    <td lay-data="{field:'id', width:100}">{$vo.id}</td>                    <td lay-data="{field:'name', width:100}">{$vo.name}</td>                    <td lay-data="{field:'description', width:100}">{$vo.description}</td>                    <td lay-data="{field:'apps_id', width:100}">{$vo.apps_id}</td>                    {if condition="$vo.items == null"}                    <td lay-data="{field:'type', width:100}"></td>                    <td lay-data="{field:'from', width:100}"></td>                    <td lay-data="{field:'url', width:100}"></td>                    {else /}                       {volist name='vo.items' id='list' key='j'}                            <td lay-data="{field:'type', width:100}">{$list.type}</td>                            <td lay-data="{field:'from', width:100}">{$list.img.from}</td>                            <td lay-data="{field:'url', width:180}">{$list.img.url}</td>                            {if condition="$j lt count($vo['items'])"}                            </tr><tr>                            <td lay-data="{field:'id', width:100}">{$vo.id}</td>                            <td lay-data="{field:'name', width:100}">{$vo.name}</td>                            <td lay-data="{field:'description', width:100}">{$vo.description}</td>                            <td lay-data="{field:'apps_id', width:100}">{$vo.apps_id}</td>                            {/if}                       {/volist}                    {/if}                </tr>            {/volist}        </tbody>