如何在JavaScript中从Firebase数据库的不同父节点检索数据

<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>

const firebaseConfig = {
  apiKey: "YOUR_API_KEY",
  authDomain: "YOUR_AUTH_DOMAIN",
  databaseURL: "YOUR_DATABASE_URL",
  projectId: "YOUR_PROJECT_ID",
  storageBucket: "YOUR_STORAGE_BUCKET",
  messagingSenderId: "YOUR_MESSAGING_SENDER_ID",
  appId: "YOUR_APP_ID"
};

firebase.initializeApp(firebaseConfig);

const database = firebase.database();

// 从parent1节点检索数据
database.ref('parent1').once('value')
  .then((snapshot) => {
    const data = snapshot.val();
    // 处理检索到的数据
    console.log(data);
  })
  .catch((error) => {
    console.error(error);
  });

// 从parent2节点检索数据
database.ref('parent2').once('value')
  .then((snapshot) => {
    const data = snapshot.val();
    // 处理检索到的数据
    console.log(data);
  })
  .catch((error) => {
    console.error(error);
  });