promise 连续then 如何取某次的值

Question

怎么办捏

promise.then(res1 => {
  return res1+1
}).then(res2 => {              
    return res2+1
}).then(res3 => {                 
    //获取res1 的值

})

Answer 1

let arr = []
Promise.resolve(55).then(res1 => {
arr.push(res1)
return res1+1
}).then(res2 => {
  arr.push(res2)
  return res2+1
}).then(res3 => {
  arr.push(res3)
  console.log('🚀 ~ Promise.resolve ~ res3', res3)
  //获取res1 的值
  const res1 = arr[0]
  console.log('🚀 ~ Promise.resolve ~ arr', arr)
})

Answer 2

这种最好是用async await，不然只能外部定义变量或者一直传下去