Promise.all的实现

Promise.all([1, read2(file1), 3]).then(data => {
    console.log(data)
},error => {
    console.log(error)
})

    this.get1()
    get1() {
      let promiseAll = Promise.all([
        new Promise((reslove, reject) => {
          setTimeout(() => {
            reslove(‘2000‘)
          }, 2000)
        }),
        new Promise((reslove, reject) => {
          setTimeout(() => {
            reslove(‘4000‘)
          }, 4000)
        })
      ])
      promiseAll.then(
        res => {
          console.log(res)  // ["2000", "4000"]
        },
        error => {
          console.log(error)
        }
      )
    },