Dart 在Flutter中解析 JSON 到 Map

我得到了后端的响应:

   {"measurements": {
            "pm10": {
              "name": "pm10",
              "value": 20.8647,
              "unit": "µg/m³"
            },
             "pm25": {
              "name": "pm10",
              "value": 20.8647,
              "unit": "µg/m³"
            },
             "o2": {
              "name": "pm10",
              "value": 20.8647,
              "unit": "µg/m³"
            }

        },
   "station": {
        "city": "{cityName}",
        "name": "{locationName}",
        "latitude": "54.353336",
        "longitude": "18.635283"
    }
    }

这就是我此刻得到的:

class Pollutions {

    Pollutions.fromJsonMap(Map<String, dynamic> map):
                measurements = Measurements.fromJsonMap(map["measurements"]),
                station = Station.fromJson(map["station"]);

  Map<String, Pollution> measurements;
  Station station;

    Map<String, dynamic> toJson() {
        final data = Map<String, dynamic>();
        data['measurements'] = measurements == null ? null : measurements.jsonDecode(measurements);
        data['station'] = station == null ? null : station.toJson();
        return data;
    }
}

在测量值中，我可以得到其他值，但我不知道它们的名称，可能是O2、O3，而不仅仅是PM10等等.我能否解析此测量值以映射key-value，其中key将是PM10，类似于:map？ map 的Pollutions.fromJsonMap种方法和toJson种方法应该是什么样子？