任意promise串行执行算法 - 童彪

  // 任意promise串行执行算法 - 童彪

function runAllPromise() {
  var p1 = new Promise((resove, reject) => {
    setTimeout(() => {
      resove('1')
    }, 2000)
  })

  var p2 = new Promise((resove, reject) => {
    resove('2')
  })

  var p3 = new Promise((resove, reject) => {
    resove('3')
  })
  var p4 = new Promise((resove, reject) => {
    resove('4')
  })
  var p5 = new Promise((resove, reject) => {
    resove('5')
  })
  var p6 = new Promise((resove, reject) => {
    setTimeout(() => {
      resove('6')
    }, 0)
  })
  let arr = [p1, p2, p3, p4, p5, p6]

  function runPromise(fns) {
    if (fns.length <= 1) {
      return fns[0].then(data => {
        console.log(data)
      })
    }
    // let itemFn = fns.splice(fns.length - 1, 1);
    let itemFn = fns.splice(0, 1)
    return itemFn[0].then((data) => {
      console.log(data)
      runPromise(fns)
    })
  }
  runPromise(arr)
}
runAllPromise()