我不知道下面的代码是最好的代码，但它解决了我的问题

function relatedBlogPost($atts){

        global $post;
       //this the the custom post type 
    
        $args_cat = array( 
            \'taxonomy\'     => \'blogs_cat\',
            \'orderby\'      => \'name\',
            \'show_count\'   => 1,
            \'pad_counts\'   => 1, 
            \'hierarchical\' => 1,
            \'echo\'         => 0
        );
        $categories = get_the_terms($post->ID, "blogs_cat"); // getting the category id of the current post
        $args = array(
                \'post_type\' => \'blog\',
                \'post_status\' => \'publish\',
                \'posts_per_page\' => 3,
                \'tax_query\' => array(
                    array(
                        \'taxonomy\' => \'blogs_cat\',
                        \'field\' => \'slug\',
                        \'terms\' => $categories[0]->slug // sending the current category slug name
                    ),
                ),
                \'post__not_in\' => array ($post->ID),
                \'order\' => \'DEC\'
            );
        
        $related = new WP_Query($args);
        if( $related->have_posts() ) { 
            $data=\'<h2 class="sectionHeading pb-5">Related Blog</h2>\';
            $data .= \'<div class="main-Blog"><ul>\';
            while( $related->have_posts() ) { 
                $related->the_post(); 
                //displaying the category name
        $terms = get_the_terms( $related->ID , \'blogs_cat\' );
        foreach ( $terms as $term ) {
        $catname=$term->name;
        }
                
     $data.= \'<li> <a href="\'.get_permalink().\'">
                            <div class="main-blogBoxwrapper">
                            <img src="\'.get_the_post_thumbnail_url().\'">
                            <div class="blogCatname">
                            <h6><span>\'.$catname.\'</span></h6>
                            <h4>\'.wp_trim_words(get_the_title(), 14, \'...\').\'</h4>
                            <p>\'.wp_trim_words(get_the_excerpt(), 20, \'...\').\'</p>
                            </div>
                            </div>
                            </a></li>\';
            }
            $data.=\'</ul></div>\';
            return $data;
            wp_reset_postdata();
        }
        
        }
        add_shortcode( \'related-blog-post\', \'relatedBlogPost\');

如果您这样做，将列出特定于类别的主题将其放在页面上，然后重试

query_posts(\'category_name=product\');