discuz文章的上一篇和下一篇 $article['preaid'] || $article['nextaid']

                <!--{if $article['preaid'] || $article['nextaid']}-->                <div class="pren pbm cl">                    <!--{if $article['prearticle']}--><em>{lang pre_article}<a href="{$article['prearticle']['url']}">{$article['prearticle']['title']}</a></em><!--{/if}-->                    <!--{if $article['nextarticle']}--><em>{lang next_article}<a href="{$article['nextarticle']['url']}">{$article['nextarticle']['title']}</a></em><!--{/if}-->                </div>                <!--{/if}-->