如何从Firebase获取数据来创建列表？

<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>

var 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);

var database = firebase.database();
var itemsRef = database.ref('items');

itemsRef.on('value', function(snapshot) {
  var items = snapshot.val();
  var itemList = document.getElementById('item-list');

  itemList.innerHTML = '';

  for (var key in items) {
    var item = items[key];
    var listItem = document.createElement('li');
    listItem.innerText = item.name;
    itemList.appendChild(listItem);
  }
});