class Author { int? mid; String? name; String? face; Author({ this.mid, this.name, this.face, }); factory Author.fromJson(Map json) => Author( mid: json['mid'] as int?, name: json['name'] as String?, face: json['face'] as String?, ); Map toJson() => { 'mid': mid, 'name': name, 'face': face, }; }