如何在flutter中将对象编码为Json

import 'dart:convert';

class Person {
  String name;
  int age;

  Person(this.name, this.age);

  // 将对象转换为Map
  Map<String, dynamic> toJson() {
    return {
      'name': name,
      'age': age,
    };
  }
}

void main() {
  Person person = Person('John', 25);

  // 将对象编码为JSON字符串
  String jsonStr = json.encode(person.toJson());
  print(jsonStr);
}

{"name":"John","age":25}