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标题: Promise用法 [打印本页]
作者: hechengjin    时间: 2016-3-26 17:01
标题: Promise用法
  1. 'use strict'

  3. let Deferred = function () {
  4.   this.promise = new Promise((resolve, reject) => {
  5.     this.resolve = resolve
  6.     this.reject = reject
  7.   })

  9.   this.promise.canceled = false
  10.   this.promise.cancelers = []
  11.   this.promise.cancel = () => {
  12.     this.promise.canceled = true
  13.     for (let canceler of this.promise.cancelers) {
  14.       try {
  15.         canceler()
  16.       } catch (e) {
  17.         console.log(e + e.stack)
  18.       }
  19.     }
  20.   }
  21.   this.then = this.promise.then.bind(this.promise)
  22.   this.catch = this.promise.catch.bind(this.promise)
  23. }

  25. exports.defer = () => new Deferred()
复制代码
第一次查询

let loadListDeferred = defer()
执行查询
loadListDeferred.then(() => {
    查询结果清除  ----这里在执行第二次查询时才会执行到
  })


第二次查询
if (oadListDeferred) {
   loadListDeferred.resolve()   ----触发上面的then操作
  }

作者: hechengjin    时间: 2016-4-15 12:11
let loadDeferred = defer()
let finished = false

  spawn(function * () {
    while (true) {
      console.log('777777777777777')
      // yield WinJS.Promise.any([sleep(1000), loadDeferred])
      yield sleep(1000)
      loadDeferred.then(() => {
        finished = true
      })
      if (finished) {
        break
      }
    }
  })

  top.tryCloseWindow = DoCommandClose.bind(top)

function DoCommandClose () {
  let ret = false
  loadDeferred.resolve()
  console.log('=======================')
  top.close()
  return ret
}





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