Firebase实时数据库无法写入数据，报错database is not a function求助

错误原因 #

你使用的是 Firebase v9+ 模块化版本，该版本已经废弃了旧版命名空间式的firebase.database()调用语法，所以才会抛出database is not a function的报错。

修复步骤 #

1. 先确认你的firebase.js配置文件已经正确初始化Firebase实例并导出，参考配置如下：

// firebase.js 配置示例
import { initializeApp } from "firebase/app";

const firebaseConfig = {
  // 替换为你自己的Firebase项目配置
  apiKey: "xxx",
  authDomain: "xxx",
  databaseURL: "xxx", // 必须填写Realtime Database的访问地址，否则也会触发报错
  projectId: "xxx",
  storageBucket: "xxx",
  messagingSenderId: "xxx",
  appId: "xxx"
};

const app = initializeApp(firebaseConfig);
export default app;

2. 业务代码中导入Realtime Database对应的模块化API，替换旧的数据库操作逻辑，修改后的完整代码如下：

import app from "../../config/firebase"
import { getAuth, signInWithPopup, FacebookAuthProvider } from "firebase/auth";
// 新增导入数据库相关方法
import { getDatabase, ref, set } from "firebase/database";


const facebook_login=()=>{
    return (dispatch)=>{
        const provider = new FacebookAuthProvider();
        const auth = getAuth();
        signInWithPopup(auth, provider)
        .then((result) => {
            console.log("Facebook Login")

            var user = result.user;
            var credential = FacebookAuthProvider.credentialFromResult(result);
            var accessToken = credential.accessToken;
            let create_user={
                name:user.displayName,
                email:user.email,
                profile:user.photoURL,
                uid:user.uid
            }
            // 替换旧的数据库调用逻辑
            const db = getDatabase(app);
            set(ref(db, `users/${user.uid}`), create_user)
            .then(()=>{
                alert("Login Successfull")
            })
        
        })
        .catch((error) => {
            const errorCode = error.code;
            const errorMessage = error.message;
            const email = error.email;
            const credential = FacebookAuthProvider.credentialFromError(error);
            console.log(errorMessage)
        });
    }
}

export{
    facebook_login
}

内容的提问来源于stack exchange，提问作者Muhammad Osama