这是一个plugin 这也是同样的道理。

function get_posts_per_taxterm($taxonomy, $term_id ){
    $posts = get_posts(
        array(
            \'posts_per_page\' => -1,
            \'post_type\' => \'post\',
            \'orderby\'  => \'menu_order\',
            \'order\'    => \'ASC\',
            \'tax_query\' => array(
                array(
                    \'taxonomy\' => $taxonomy,
                    \'field\' => \'term_id\',
                    \'terms\' => $term_id,
                    \'include_children\' => false
                )
            )
        )
    );
    // `first_post_id` is a global variable which contains the ID of the post which comes first inside TOC
    // @toDo Find a better way
    global $first_post_id;
    if(!isset($first_post_id)){
        if (!empty($posts)){
            $first_post_id = $posts[0]->ID;
        }
    }
    return $posts;
}
function get_array_of_posts_grouped_by_taxterms($terms, $parent_id = 0, $outputs = []) {
    foreach ($terms as $term) {
        if ($parent_id == $term->parent) {
            $outputs[\'<a data-id = "\'.$term->term_id.\'" class = "elementor-kb-term-href stm-content" href =\'.get_term_link($term->term_id).\'>\'.$term->name.\'</a>\'] = get_array_of_posts_grouped_by_taxterms( $terms, $term->term_id);
            $posts= get_posts_per_taxterm(\'category\',$term->term_id);
            foreach ($posts as $post){
                $outputs[\'<a data-id = "\'.$term->term_id.\'" class = "elementor-kb-term-href stm-content" href =\'.get_term_link($term->term_id).\'>\'.$term->name.\'</a>\'][] = \'<a class = "elementor-kb-post-href stm-content" href=\'.get_permalink($post->ID).\' data-id="\'.$post->ID.\'">\'.$post->post_title.\'</a>\';
            }
        }
    }
    return $outputs;
}