如何在一个 JavaScript 应用中合并多个 Firebase 项目

import { initializeApp } from "firebase/app";
import { getFirestore } from "firebase/firestore";
import { getStorage } from "firebase/storage";

// 第一个 Firebase 项目的配置
const firebaseConfig1 = {
  apiKey: "YOUR_API_KEY_1",
  authDomain: "YOUR_AUTH_DOMAIN_1",
  projectId: "YOUR_PROJECT_ID_1",
  storageBucket: "YOUR_STORAGE_BUCKET_1",
  messagingSenderId: "YOUR_MESSAGING_SENDER_ID_1",
  appId: "YOUR_APP_ID_1"
};

// 第二个 Firebase 项目的配置
const firebaseConfig2 = {
  apiKey: "YOUR_API_KEY_2",
  authDomain: "YOUR_AUTH_DOMAIN_2",
  projectId: "YOUR_PROJECT_ID_2",
  storageBucket: "YOUR_STORAGE_BUCKET_2",
  messagingSenderId: "YOUR_MESSAGING_SENDER_ID_2",
  appId: "YOUR_APP_ID_2"
};

// 初始化第一个 Firebase 项目，命名为 "project1"
const app1 = initializeApp(firebaseConfig1, "project1");

// 初始化第二个 Firebase 项目，命名为 "project2"
const app2 = initializeApp(firebaseConfig2, "project2");

// 获取第一个项目的 Firestore 实例
const db1 = getFirestore(app1);

// 获取第二个项目的 Firestore 实例
const db2 = getFirestore(app2);

// 获取第一个项目的 Storage 实例
const storage1 = getStorage(app1);

// 获取第二个项目的 Storage 实例
const storage2 = getStorage(app2);

export { db1, db2, storage1, storage2 };

import { db1, db2 } from './firebase';
import { collection, getDocs } from "firebase/firestore";

async function fetchData() {
  // 从第一个项目的 Firestore 中获取数据
  const collectionRef1 = collection(db1, "collection1");
  const querySnapshot1 = await getDocs(collectionRef1);
  querySnapshot1.forEach((doc) => {
    console.log("Project 1 Data:", doc.data());
  });

  // 从第二个项目的 Firestore 中获取数据
  const collectionRef2 = collection(db2, "collection2");
  const querySnapshot2 = await getDocs(collectionRef2);
  querySnapshot2.forEach((doc) => {
    console.log("Project 2 Data:", doc.data());
  });
}

fetchData();