Question

我正在为那个努力。我有旧数据。我想在5秒钟的间隔内调用API，直到获得该数据的新等值。我正在尝试这样（参见代码内的注释）：

const requestTimeout = async(currentData, resolve) => {
  //that's my working call to API ;)
  const { data } = await requestGet(URL.LOTTERIES_LIST);

  // if old data is equal to new data let's try again until the backend API will finally change data to new
  if(currentData === data.newData) {
    this.setTimeout(requestTimeout(currentData, resolve), 5000);
  } else {
    resolve(data.newData);
  }
};

// this is a function which is called from another part of app, I need to return/resolve a new data from here, current Data is just old piece of data 
export function callUntilNewDataArrives(shouldCallAPI, currentData) {
  return new Promise(resolve => {
    if (shouldCallAPI) {
      requestTimeout(currentData, resolve);
    }
  });

正如该应用程序另一部分中的注释所述，我试图像这样简单地使用callUntilNewDataArrives函数：

callUntilNewDataArrives(shouldCallAPI, currentData)
      .then(res => console.log(res));

但是这不起作用。谢谢您的帮助！

Answer 1

我认为问题在于您的对象比较。使用旧数据解决承诺的唯一可能原因是： if(currentData === data.newData)每次都返回false。我会在调试器中检查它以确保。

重复API请求，直到新数据到达

1 个答案: