thinkphp 3.2 volist循环中使用for标签

<volist name="data_init" id="vo">
<tr class="odd gradeA">
<for start="0" end="$field_num">
<td>{$vo[$field[$i]]}</td>
</for>
<php>if($auth->check( 'admin/form/update',  session('uid') )||$auth->check( 'admin/form/del',  session('uid') )){</php>
<td class="center">
<php>if($auth->check( 'admin/form/update',  session('uid') )){</php>
<a href="/admin/form/update?id={$vo.id}"  class="badge badge-primary">修改</a>  
<php>}</php>
<php>if($auth->check( 'admin/form/del',  session('uid') )){</php>
<a href="javascript:void(0);" class="badge badge-danger" onclick="confirm_del(this)" data-url="{:u('del')}" data-id="{$vo.id}" data-msg="确定要删除吗?">删除</a>  
<php>}</php>
</td>
<php>}</php>
</tr>
</volist>