你为什么要避免the_postthumbnail? 如果使用正确的属性，它可以为您提供所需的确切html。无论如何，您可以访问图像的标题和alt标记，如下所示：

// get the ID of the featured image
$thumbnail_id = get_post_thumbnail_id( $post_id );
// retrieve title (an image is a post, so you can access the title as if it is a post title)
$title = get_post($thumbnail_id())->post_title;
// retrieve alt (which is stored as metadata to a post)
$alt = get_post_meta($thumbnail_id, \'_wp_attachment_image_alt\', true);