fastadmin的cms插件是如何调用上一篇下一篇的？
<ul class="article-prevnext">
<!-- S 上一篇下一篇 -->
{cms:prevnext id="prev" type="prev" archives="__ARCHIVES__.id" channel="__CHANNEL__.id"}
<li>
<span>{:__('Prev')} ></span>
<a href="{$prev.url}">{$prev.title|htmlentities}</a>
</li>
{/cms:prevnext}
{cms:prevnext id="next" type="next" archives="__ARCHIVES__.id" channel="__CHANNEL__.id"}
<li>
<span>{:__('Next')} ></span>
<a href="{$next.url}">{$next.title|htmlentities}</a>
</li>
{/cms:prevnext}
<!-- E 上一篇下一篇 -->
</ul>
