织梦arclist循环前两个样式与后面的不同

{dede:arclist typeid='4' row='12' titlelen='150' }
[field:array runphp=yes]
($GLOBALS[autoindex]<=2) ? @me="<li><h3><a href='{@me['arcurl']}'  title='{@me['title']}' >{@me['title']}</h3></a><p>".cn_substr(@me['description'],130)."</p></li>":@me="<li  class='l_index_ul4'><h3><a href='{@me['arcurl']}'>{@me['title']}</a></h3></li>";[/field:array]
{/dede:arclist}