Firebase Firestore分页最佳实践/优化与否？

// 初始化 Firestore
const db = firebase.firestore();

// 查询第一页数据
let lastVisible = null;
const pageSize = 10;

function loadFirstPage() {
  db.collection('items')
    .orderBy('createdAt')
    .limit(pageSize)
    .get()
    .then((snapshot) => {
      snapshot.docs.forEach((doc) => {
        console.log(doc.id, ' => ', doc.data());
      });
      lastVisible = snapshot.docs[snapshot.docs.length - 1];
    });
}

// 加载下一页数据
function loadNextPage() {
  if (lastVisible) {
    db.collection('items')
      .orderBy('createdAt')
      .startAfter(lastVisible)
      .limit(pageSize)
      .get()
      .then((snapshot) => {
        snapshot.docs.forEach((doc) => {
          console.log(doc.id, ' => ', doc.data());
        });
        lastVisible = snapshot.docs[snapshot.docs.length - 1];
      });
  }
}

// 加载第一页数据
loadFirstPage();