js循环中的异步

const forLoop = async _ => {
  console.log('Start')

  for (let index = 0; index < fruitsToGet.length; index++) {
    const fruit = fruitsToGet[index]
    const numFruit = await getNumFruit(fruit)
    console.log(numFruit)
  }

  console.log('End')
}

for循环await、async这样就没问题
foreach不支持await,async
map：

const mapLoop = async _ => {
  console.log('Start')

  const promises = fruitsToGet.map(async fruit => {
    const numFruit = await getNumFruit(fruit)
    return numFruit
  })

  const numFruits = await Promise.all(promises)
  console.log(numFruits)

  console.log('End')
}