thinkphp前端获取数组，循环数组

<div class="server">
   <span>支持服务</span>
   <if condition="$alltag">
      <volist name="alltag" id="vo" key="k">   //k值获取数组的长度坐标，从1开始，$alltag为数组
         <div class="server_item  bg_<{$k}>">
            <{$alltag[$k-1]}>
         </div>
      </volist>
   </if>
</div>