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实现简单的promise #8

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实现简单的promise #8

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22 changes: 16 additions & 6 deletions index.js
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Original file line number Diff line number Diff line change
Expand Up @@ -8,19 +8,22 @@ function myPromise(constructor) {
self.reason = undefined;//定义状态为rejected的时候的状态

function resolve(value) {

// TODO resolve如何改变状态及返回结果
if (self.status === "pending") {
self.status = "resolved";
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

try {

constructor(resolve, reject);
Expand All @@ -35,7 +38,14 @@ function myPromise(constructor) {

myPromise.prototype.then = function (onFullfilled, onRejected) {

//TODO then如何实现
// 实现then方法
let self = this;
if (self.status === "resolved") {
onFullfilled(self.value);
}
if (self.status === "rejected") {
onRejected(self.reason);
}

}
module.exports = myPromise
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