所以，我想在我的查询中绘制缩略图add_theme_support, 它说，您必须具备该功能才能启用以下操作：thumbnail, 所以我在函数中加入了以下内容

function pippin_add_thumbnail_support() {
    if(!current_theme_supports(\'post-thumbnails\')) {
        add_theme_support(\'post-thumbnails\');
    }
}
add_action(\'init\', \'pippin_add_thumbnail_support\');

<?php
            $posts = get_posts(array(\'posts_per_page\' => 4));
            foreach ($posts as $post) {
                if( has_post_thumbnail()){
                    get_the_post_thumbnail($post->ID,\'thumbnail\');

                echo $post->post_title;
                }