如何用无限滚动修复'Cannot read property‘of undefined’的'getCellPosition‘属性

let data = []; // 确保数据已经初始化

function getCellPosition(index) {
  if (data[index]) {
    return data[index].position;
  } else {
    console.error("Index out of bounds");
    return null;
  }
}

function getCellPosition(index) {
  try {
    return data[index].position;
  } catch (e) {
    console.error("Error accessing cell position:", e);
    return null;
  }
}

let isLoading = false;

window.addEventListener('scroll', function() {
  if (window.innerHeight + window.scrollY >= document.body.offsetHeight - 500 && !isLoading) {
    isLoading = true;
    fetchMoreData().then(newData => {
      data = data.concat(newData);
      isLoading = false;
    }).catch(error => {
      console.error("Error fetching more data:", error);
      isLoading = false;
    });
  }
});

function fetchMoreData() {
  // 模拟异步请求数据
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve([
        { position: 1 },
        { position: 2 },
        { position: 3 }
      ]);
    }, 1000);
  });
}