打开模板（以触屏版为例）
\template\default\touch\forum\forumdisplay.htm
将代码
<!--{loop $_G['forum_threadlist'] $key $thread}-->
<!--{if !$_G['setting']['mobile']['mobiledisplayorder3'] && $thread['displayorder'] > 0}-->
{eval continue;}
<!--{/if}-->
<!--{if $thread['displayorder'] > 0 && !$displayorder_thread}-->
{eval $displayorder_thread = 1;}
<!--{/if}-->
<!--{if $thread['moved']}-->
<!--{eval $thread[tid]=$thread[closed];}-->
<!--{/if}-->
<li>
<!--{hook/forumdisplay_thread_mobile $key}-->
<a href="forum.php?mod=viewthread&tid=$thread[tid]&extra=$extra" $thread[highlight] >
{$thread[subject]}
<span class="by">$thread[author]</span>
</a>
<span class="num">{$thread[replies]}</span>
<!--{if in_array($thread['displayorder'], array(1, 2, 3, 4))}-->
<span class="icon_top"><img src="{STATICURL}image/mobile/images/icon_top.png"></span>
<!--{elseif $thread['digest'] > 0}-->
<span class="icon_top"><img src="{STATICURL}image/mobile/images/icon_digest.png"></span>
<!--{elseif $thread['attachment'] == 2 && $_G['setting']['mobile']['mobilesimpletype'] == 0}-->
<span class="icon_tu"><img src="{STATICURL}image/mobile/images/icon_tu.png"></span>
<!--{/if}-->
</li>
<!--{/if}-->
{eval $index++;}
<!--{/loop}-->
修改为
{eval $index=0;}
<!--{loop $_G['forum_threadlist'] $key $thread}-->
<!--{if !$_G['setting']['mobile']['mobiledisplayorder3'] && $thread['displayorder'] > 0}-->
{eval continue;}
<!--{/if}-->
<!--{if $thread['displayorder'] > 0 && !$displayorder_thread}-->
{eval $displayorder_thread = 1;}
<!--{/if}-->
<!--{if $thread['moved']}-->
<!--{eval $thread[tid]=$thread[closed];}-->
<!--{/if}-->
<li>
<!--{hook/forumdisplay_thread_mobile $key}-->
<a href="forum.php?mod=viewthread&tid=$thread[tid]&extra=$extra" $thread[highlight] >
{$thread[subject]}
<span class="by">$thread[author]</span>
</a>
<span class="num">{$thread[replies]}</span>
<!--{if in_array($thread['displayorder'], array(1, 2, 3, 4))}-->
<span class="icon_top"><img src="{STATICURL}image/mobile/images/icon_top.png"></span>
<!--{elseif $thread['digest'] > 0}-->
<span class="icon_top"><img src="{STATICURL}image/mobile/images/icon_digest.png"></span>
<!--{elseif $thread['attachment'] == 2 && $_G['setting']['mobile']['mobilesimpletype'] == 0}-->
<span class="icon_tu"><img src="{STATICURL}image/mobile/images/icon_tu.png"></span>
<!--{/if}-->
</li>
<!--{if in_array($index,array(2,6,9))}-->
<li>
<!--上面一行添加广告代码-->
</li>
<!--{/if}-->
{eval $index++;}
<!--{/loop}-->
修改说明
in_array($index,array(2,6,9)表示在第3、第7、第10个主题后面插入一个广告位，广告代码在上面所示位置；
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