class CategoryMo {
 String name;
 int count;

 CategoryMo({this.name, this.count});
 //將map轉(zhuǎn)成mo
 CategoryMo.fromJson(Map<String, dynamic> json) {
 name = json['name'];
 count = json['count'];
 }
 //將mo轉(zhuǎn)成map，可缺省
 Map<String, dynamic> toJson() {
 final Map<String, dynamic> data = new Map<String, dynamic>();
 data['name'] = this.name;
 data['count'] = this.count;
 return data;
 }
}

{
 "name": "Jack",
 "age": 20
}

var personMap = {
 "name": "Jack",
 "age": 20
};
Person person = Person.fromJson(personMap);
print('name:${person.name}');
print('age:${person.age}');

dependencies:
...
 dio: ^3.0.10
 json_annotation: ^3.1.0


dev_dependencies:
...
 json_serializable: ^3.5.0
 build_runner: ^1.0.0

{
 "code": 0,
 "method": "GET",
 "requestPrams": "dd"
}

import 'package:json_annotation/json_annotation.dart';

// result.g.dart 將在我們運(yùn)行生成命令后自動生成
part 'result.g.dart';

///這個(gè)標(biāo)注是告訴生成器，這個(gè)類是需要生成Model類的
@JsonSerializable()
class Result {
 //定義構(gòu)造方法
 Result(this.code, this.method, this.requestPrams);
 //定義字段
 int code;
 String method;
 String requestPrams;

 //固定格式，不同的類使用不同的mixin即可
 factory Result.fromJson(Map<String, dynamic> json) => _$ResultFromJson(json);
 //固定格式
 Map<String, dynamic> toJson() => _$ResultToJson(this);
}

flutter packages pub run build_runner build