在当前主题的 functions.php 末尾加入以下内容

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function showThumbnail($widget)
{
    // 当文章内无图片时的默认缩略图，自行修改，我这里直接调用的必应壁纸接口
    $random = 'https://bing-phi.vercel.app/';
    $attach = $widget->attachments(1)->attachment;
    $pattern = '/\<img.*?src\=\"(.*?)\"[^>]*>/i';

if (preg_match_all($pattern, $widget->content, $thumbUrl)) {
         echo $thumbUrl[1][0];
    } else     if ($attach->isImage) {
      echo $attach->url;
    } else {
        echo $random;
    }
}

编辑当前主题的 header.php ，在 <head> 内加入以下内容

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<!-- 首页的 meta，自行修改内容 -->
<?php if($this->is('index')): ?>
<meta property="og:url" content="https://v2try.com/"/>
<meta property="og:type" content="blog"/>
<meta property="og:title" content="We To Try"/>
<meta property="og:image" content="<?php showThumbnail($this); ?>"/>
<meta property="og:author" content="v2try"/>
<meta property="og:site_name" content="We To Try"/>
<meta property="og:description" content="网络日志"/>
<meta property="og:locale:alternate" content="zh_CN"/>
<?php endif; ?>

<!-- 其它页面的 meta ，不需要修改 -->
<?php if($this->is('post')||$this->is('page')): ?>
<meta property="og:url" content="<?php $this->permalink(); ?>"/>
<meta property="og:type" content="blog"/>
<meta property="og:title" content="<?php $this->title(); ?>"/>
<meta property="og:image" content="<?php showThumbnail($this); ?>"/>
<meta property="og:author" content="<?php $this->author(); ?>"/>
<meta property="og:site_name" content="<?php $this->options->title(); ?>"/>
<meta property="og:description" content="<?php $this->description(); ?>"/>
<meta property="og:locale:alternate" content="zh_CN"/>
<?php endif; ?>