抛出错误时如何在循环中重试获取 [英] How to retry fetch in a loop when it throws an error

问题描述

我有以下JS函数:

func() {
  return fetch({
    ...
  }).then({
    ...
  })catch({
    ...
  })
}

在其中我返回由 fetch()返回的承诺.万一它失败了(即调用 catch()块)，我想重复一遍.有点像把整个东西放在 while(true)循环中，但是我不知道如何用promises来做到这一点.

In it I return a promise returned by fetch(). In the event that it fails (ie calls catch() block) I want to repeat the whole thing. Something like having the whole thing in a while (true) loop, but I can't figure out how to do this with promises.

有什么建议吗?

推荐答案

您应该仔细查看Promise和异步等待.

you should have a close look to promises and async await.

async function fetchUntilSucceeded() {
  let success = false;
  while(!success) {
    try {
      let result = await fetch(...);
      success = true;
      //do your stuff with your result here
    } catch {
      //do your catch stuff here
    }
  }
}

如果您只需要结果:

async function fetchUntilSucceeded() {
  while(true) {
    try {
      return await fetch(...);
    } 
  }
}

但是请谨慎使用此类代码，因为它可能永远无法解决！而且它可以发送很多请求，而无需等待时间.

But be careful with such code as it might never resolve! also it can send a lot of requests without any waittime in between.

这篇关于抛出错误时如何在循环中重试获取的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！