javascript - 那么如何将数据推送到 promise 中的数组呢？

Question

我一直在想办法。我如何将结果从 promise 循环推送到数组。谁能指出我正确的位置？

const ids = [1, 2, 3]
let results = []

for (let id of ids) {
    getLight(id)
        .then(light => {
            results.push(light)
        })
        .catch(err => {
            console.log(err)
        })
}

Answer 1

const ids = [1, 2, 3]
let results = []

Promise.all(
  ids.map((id) =>
    getLight(id)
    .then(light => {
      results.push(light)
    })
    .catch(err => {
      console.log(err)
    })
  )).then(() => console.log(results))

function getLight(id) {
  return new Promise((res) => {
    setTimeout(res, 1000)
  }).then(() => `light for id: ${id}`)
}

使用异步/等待

(async() => {

  const ids = [1, 2, 3]
  let results = await Promise.all(
    ids.map((id) =>
      getLight(id))
  )

  console.log(results);
})()

function getLight(id) {
  return new Promise((res) => {
    setTimeout(res, 1000)
  }).then(() => `light for id: ${id}`)
}