card-img 不显示 the_post_thumbnail()

Answer 1

我不太确定我是否理解你的问题。您必须在代码中添加

the_post_thumbnail();

。您可以在这里找到更多信息：

Wordpress 帖子缩略图参考

<div class="container text-center">
<h3>Diseño general</h3>
    <div class="row">
        <div class="col-md-4">
            <div class="card bg-dark text-white">
  <img src="https://es.unesco.org/sites/default/files/ai-conference-middle.jpg" class="card-img" alt="...">
  <div class="card-img-overlay">
    <h5 class="card-title">Card title</h5>
    <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
    <p class="card-text">Last updated 3 mins ago</p>

    <!-- Display post thumbnail here -->
    <?php the_post_thumbnail('full', ['class' => 'card-img']); ?>

  </div>
</div>
        </div>
    </div>
</div>

['class' => 'card-img']

数组将card-img 类添加到缩略图中。你可以根据需要修改CSS。