如何在Flutter中创建和读取用于在Firestore中存储数据的键值对(map)数组

import 'package:firebase_core/firebase_core.dart';
import 'package:cloud_firestore/cloud_firestore.dart';

void main() async {
  WidgetsFlutterBinding.ensureInitialized();
  await Firebase.initializeApp();
  runApp(MyApp());
}

import 'package:cloud_firestore/cloud_firestore.dart';

// 创建键值对数组
void createKeyValueArray() async {
  FirebaseFirestore firestore = FirebaseFirestore.instance;

  Map<String, dynamic> keyValueArray = {
    'key1': 'value1',
    'key2': 'value2',
    'key3': 'value3',
  };

  await firestore.collection('collectionName').doc('documentId').set(keyValueArray);
}

// 读取键值对数组
void readKeyValueArray() async {
  FirebaseFirestore firestore = FirebaseFirestore.instance;

  DocumentSnapshot snapshot = await firestore.collection('collectionName').doc('documentId').get();

  if (snapshot.exists) {
    Map<String, dynamic> keyValueArray = snapshot.data();
    print(keyValueArray);
  } else {
    print('Document does not exist');
  }
}