织梦dedecms列表循环判断增加样式的办法

{dede:arclist typeid='3' row='8'}    
       <li class="m[field:global.autoindex/]">    
          <a href="[field:arcurl/]"><img src="[field:litpic/]" /></a>    
       </li>    
    [field:global name=autoindex runphp='yes'] (@me!=3)? @me="":@me="<li class='on'></li>"; [/field:global]    
{/dede:arclist}

[field:global name="autoindex" runphp="yes"](@me % 2 == 0)?@me="class='red'":@me="class='blue'";[/field:global]