谷歌Firestore承诺

// 安装 Firebase SDK
npm install firebase

// 引入 Firebase
import firebase from 'firebase/app';
import 'firebase/firestore';

// 初始化 Firebase
const firebaseConfig = {
  apiKey: "your-api-key",
  authDomain: "your-auth-domain",
  projectId: "your-project-id",
  storageBucket: "your-storage-bucket",
  messagingSenderId: "your-messaging-sender-id",
  appId: "your-app-id"
};

firebase.initializeApp(firebaseConfig);

// 获取 Firestore 实例
const db = firebase.firestore();

// 添加数据
db.collection("users").add({
  name: "Alice",
  age: 25
});

// 查询数据
db.collection("users").where("age", ">", 20).get().then((querySnapshot) => {
  querySnapshot.forEach((doc) => {
    console.log(`${doc.id} => ${doc.data().name}`);
  });
});

// 监听数据
db.collection("users").onSnapshot((querySnapshot) => {
  querySnapshot.docChanges().forEach((change) => {
    if (change.type === "added") {
        console.log("New user: ", change.doc.data());
    }
  });
});