Async/Await

前端开发Kingcean 2020-01-23

async function firstAsync () {
   return 27 //return Promise.resolve(27)
}

firstAsync().then(val => {
   console.log(val)
})
 
console.log(firstAsync() instanceof Promise) //true

async function fun () {
  let promise = new Promise((resolve,reject) => {
      setTimeout(function () {
          resolve(‘now it is done‘)
      },1000)
  })
  console.log(await promise)
  console.log(await Promise.resolve(40))
  console.log(2)
  return Promise.resolve(3)
}
fun().then(val => {
  console.log(val)
})

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