在门户列表页中，默认为党文章中包含有图片是选择第一张作为列表页上的封面。如下图：
但是有时候为了美观与一致性需要在文章里面没有包含图片时，封面照样显示图片。那怎么办？
方法（Discuz！X3.2亲测可行）：
1、在根目录下面source\module\portal里面找到portal_list.php文件。打开
127-129行代码为：
if($value['pic']) {
$value['pic'] = pic_get($value['pic'], '', $value['thumb'], $value['remote'], 1, 1);
}
复制代码
含义也就是，获取文章中第一张图片作为封面（是在$value['pic']为true的情况下）
2、对上面代码进行改造
if($value['pic']) {
$value['pic'] = pic_get($value['pic'], '', $value['thumb'], $value['remote'], 1, 1);
}else{
$value['pic'] = 'source/plugin/forum_index/static/cover_'.($value[aid]%10).'.gif';
}
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关键：$value['pic'] = 'source/plugin/forum_index/static/cover_'.($value[aid]%10).'.gif'; 这一行代码。
含义：在文章不包含图片时，即$value['pic']为false时。从source/plugin/forum_index/static/下面存在的10张图片中随机选取一张作为封面
$value[aid]中aid为portal_article_title表中该文章的aid（该值为门户文章中第几篇文章）
为什么这样改呢？
默认模板目录default下面的portal里面的list.html文件中
<!--{if $value[pic]}--><div class="atc"><a href="$article_url" target="_blank"><img src="$value[pic]" alt="$value[title]" class="tn" /></a></div><!--{/if}-->
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<img src="$value[pic]" alt="$value[title]" class="tn" /> 中的$value[pic]对应 $value['pic']
核心点：
1、source/plugin/forum_index/static/这个路径下面必须存在10张图片（当然，这个路径你可以根据自己需要改为其他的路径）
2、原先只针对 if($value['pic']) 为true的情况。现在多添加了为false的情况（文章中不存在图片）
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