import 'package:json_annotation/json_annotation.dart'; part 'message.g.dart'; @JsonSerializable() class MessageModel { String? title;//消息名称 String? did;//消息设备id String? userId;//消息用户id String? userName;//消息用户名称 DateTime? createTime;//消息创建时间 int? type;//消息类型 MessageModel(); static MessageModel fromJson(Map json) => _$MessageModelFromJson(json); Map toJson() => _$MessageModelToJson(this); }