javascript - 获取数组变量react元素的位置

Question

我试图根据我的卷轴的位置来获得一个城市。

拍卖数据：

[{"id": -1}, {"User": {"_deleted": null, "_lastChangedAt": 1624758300151, "_version": 2, "createdAt": "2021-06-27T01:44:00.636Z", "id": "bbba1e58-64a4-4b8d-ae93-d60e14601461", "name": "Just in Time", "owner": null, "subscribers": "culpa adipisicin", "thumbnail": "excepteur occaecat volupt", "updatedAt": "2021-06-27T01:45:00.127Z"}, "_deleted": null, "_lastChangedAt": 1624853545493, "_version": 7, "city": "California", "country": "USA", "createdAt": "2021-06-27T03:30:03.710Z", "description": "ut adipisicing la", "dislikes": 25, "expiration": 30, "id": "d9e5be9f-21cd-4e09-82e9-e70bf4c51204", "likes": 24, "owner": null, "rating": 4, "thumbnail": "https://pretest.s3.amazonaws.com/CarChase.png", "title": "Auction 2", "updatedAt": "2021-06-28T04:12:25.466Z", "userID": null, "views": 17}, {"User": {"_deleted": null, "_lastChangedAt": 1624758300151, "_version": 2, "createdAt": "2021-06-27T01:44:00.636Z", "id": "bbba1e58-64a4-4b8d-ae93-d60e14601461", "name": "Just in Time", "owner": null, "subscribers": "culpa adipisicin", "thumbnail": "excepteur occaecat volupt", "updatedAt": "2021-06-27T01:45:00.127Z"}, "_deleted": null, "_lastChangedAt": 1624764983268, "_version": 8, "city": "Florida", "country": "USA", "createdAt": "2021-06-27T01:44:08.334Z", "description": "amet laborum officia sint ut m", "dislikes": 16, "expiration": 27, "id": "03c5504c-de2a-483d-8dc4-be4282a668e2", "likes": 30, "owner": null, "rating": 2, "thumbnail": "https://pretest.s3.amazonaws.com/CarChase.png", "title": "Auction 1", "updatedAt": "2021-06-27T03:36:23.244Z", "userID": "bbba1e58-64a4-4b8d-ae93-d60e14601461", "views": 29}, {"id": -2}]

代码

  // Scroll - Primary
  const mainScrollX = useRef(new Animated.Value(0)).current;

const city = { '0': 'California', '130': 'Florida' };

const groupCity = useMemo(
  () => auction.filter((target) => target.city === city[130]),
  [mainScrollX]
);



  console.log('---');
  console.log(mainScrollX);
  console.log(groupCity);
  console.log(city[0]);
  console.log(city[130]);
  console.log(city[mainScrollX]);
  console.log('---');

我不确定是否需要在“mainScrollX”上进行转换，它在 0 时似乎有问题。

mainScrollX 为 0 或 130。

在 0 时，

 LOG  ---
 LOG  0
 LOG  []
 LOG  California
 LOG  Florida
 LOG  undefined
 LOG  ---

在 130 岁时，

 LOG  ---
 LOG  130
 LOG  []
 LOG  California
 LOG  Florida
 LOG  undefined
 LOG  ---

标签： javascriptarraysreactjsreact-nativesorting