如何在节点js中有延迟的循环中迭代每个项目

Question

I am working a on a twitter monitor in node, and I each time I send a request to the twitter api, I loop through the array of twitter api keys, I want to have a 3 second delay between each loop iteration,

我尝试使用 setTimeout 但这不起作用

const apiarray =  [new twit({
    consumer_key: '5435435435435',
    consumer_secret: '5435435345345',
    access_token: 'tewrt43543354355453',
    access_token_secret: '48239478234923047324734' 

    }),
    new twit({
    consumer_key: '3213235543254343534543',
    consumer_secret: '8768768768678768',
    access_token: '765474657765756745',
    access_token_secret: '65434563654634643654643'
})]


let counter = 0
let tweet_stay = []
let tweet_info = () => { 
    apiarray.forEach(function (item) {
        item.get('lists/statuses', {slug: 'slughere', owner_screen_name: 'namehere', count: 1, include_rts: false}, (err, data, response) => {
            counter ++
            console.log(counter)
            if (counter == 1) {
                tweet_stay.push(data[0].id)
                console.log('tweet ID added')
            }
       }
}
setInterval(tweet_info, 3000)

Answer 1

您需要将计时器包装在 promise 中，以便等待。 然后，您可以将 tweet_info 设为异步 function 并使用包装的计时器来延迟迭代。

请注意，您必须使用for循环而不是forEach ：

let delay = ms => {
  return new Promise(resolve => {
    setTimeout(resolve, ms)
  })
}

let tweet_info = async () => {
  for (let i = 0; i < apiarray.length; i++) {
    await delay(3000)
    // do something else here
  }
}