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Tony Yan #24

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17 changes: 15 additions & 2 deletions index.js
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Original file line number Diff line number Diff line change
@@ -1,3 +1,7 @@
const pending = 'pending'
const fulfilled = 'fulfilled'
const rejected = 'rejected'

function myPromise(constructor) {
let self = this;

Expand All @@ -10,13 +14,20 @@ function myPromise(constructor) {
function resolve(value) {

// TODO resolve如何改变状态及返回结果
if (self.status === pending) {
self.status = fulfilled
self.value = value
}

}

function reject(reason) {

// TODO reject如何改变状态及返回结果

if (self.status === pending) {
self.status = rejected
self.reason = reason
}
}

//捕获构造异常
Expand All @@ -36,6 +47,8 @@ function myPromise(constructor) {
myPromise.prototype.then = function (onFullfilled, onRejected) {

//TODO then如何实现

if (this.status === fulfilled) onFullfilled(this.value)

if (this.status === rejected) onRejected(this.reson)
}
module.exports = myPromise