假设您的主题正在使用comment_class();

示例（将添加到主题的functions.php中）：

add_filter( \'comment_class\', \'comment_class_logged_in_user\' );

function comment_class_logged_in_user( $classes ) {
    global $comment;
    if ( $comment->user_id > 0 && is_user_logged_in() ) {
        global $current_user; get_currentuserinfo();
        $logged_in_user = $current_user->ID;
        if( $comment->user_id == $logged_in_user ) $classes[] = \'comment-author-logged-in\';
    }
return $classes;
}

.comment-author-logged-in { }