使用 setInterval 异步等待

问题描述

function first(){
  console.log('first')
}
function second(){
  console.log('second')
}
let interval = async ()=>{
  await setInterval(first,2000)
  await setInterval(second,2000)
}
interval();

想象一下我上面有这段代码.

Imagine that I have this code above.

当我运行它时，first() 和second() 会被同时调用；如何在first)()返回一些数据后调用second()，例如，如果first()完成，则只有调用second()?

When I run it, first() and second() will be called at the same time; how do I call second() after first)() returns some data, for example, if first() is done, only then call second()?

因为我的代码中的 first() 将处理大量数据，如果这两个函数同时调用，服务器将很难.

Because first() in my code will be working with a big amount of data and if this 2 functions will be calling at the same time, it will be hard for the server.

每次当first()返回一些数据时，我如何调用second()?

How do I call second() each time when first() will return some data?

推荐答案

如上所述，setInterval 不能很好地与 Promise 如果你不阻止它.如果您清除了间隔，您可以像这样使用它:

As mentioned above setInterval does not play well with promises if you do not stop it. In case you clear the interval you can use it like:

async function waitUntil(condition) {
  return await new Promise(resolve => {
    const interval = setInterval(() => {
      if (condition) {
        resolve('foo');
        clearInterval(interval);
      };
    }, 1000);
  });
}

以后你可以像这样使用

const bar = waitUntil(someConditionHere)

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