如何用javascript从firebase中的孩子中获取子值？

<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>

// 初始化Firebase
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);

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

- users
  - user1
    - name: "John"
    - age: 25
  - user2
    - name: "Jane"
    - age: 30

// 获取特定用户的姓名
const userId = "user1";
const nameRef = database.ref("users/" + userId + "/name");

nameRef.on("value", (snapshot) => {
  const name = snapshot.val();
  console.log(name);
});