从firebase获取数据并将其存储在javascript变量中

<script src="https://www.gstatic.com/firebasejs/9.0.2/firebase-app.js"></script>
<script src="https://www.gstatic.com/firebasejs/9.0.2/firebase-database.js"></script>

// 替换成你的项目配置信息
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"
};

// 初始化Firebase
firebase.initializeApp(firebaseConfig);

// 获取数据库引用
const database = firebase.database();

// 从数据库中获取数据
database.ref('users').once('value')
  .then((snapshot) => {
    // 将数据存储在JavaScript变量中
    const usersData = snapshot.val();
    console.log(usersData);
  })
  .catch((error) => {
    console.error(error);
  });