<!--{foreach from=$new_articles item=article name="new_articles"}-->
<!-- {if $smarty.foreach.new_articles.index lt 13} **文章显示数量 -->
<div class="middtline">· {$smarty.foreach.new_articles.iteration}<a title="{$article.title|escape:html}" href="{$article.url}">{$article.short_title|truncate:13:"...":true}</a></div> 
<!--{/if}--> 
<!--{/foreach}-->

注:加上 {$smarty.foreach.new_articles.iteration}