如何获得所有Json Body的孩子，Flutter

import 'dart:convert';

void main() {
  String jsonString = '{"name": "John", "age": 25, "address": {"city": "New York", "state": "NY"}}';

  // 将JSON字符串转换为Map对象
  Map<String, dynamic> jsonBody = json.decode(jsonString);

  // 遍历JSON Body的所有孩子
  jsonBody.forEach((key, value) {
    print('Key: $key');

    // 如果孩子的值是一个Map对象，则遍历该Map对象的孩子
    if (value is Map) {
      value.forEach((childKey, childValue) {
        print('Child Key: $childKey, Child Value: $childValue');
      });
    }
  });
}

Key: name
Key: age
Key: address
Child Key: city, Child Value: New York
Child Key: state, Child Value: NY