原生JS実現Promise

1週間に少なくとも1つの計画を完成させるために、まだ説明を書いていないので、ソースコードを置いておきます.理解しやすいように、コードを相対的に精錬するように調整しました.最近アルゴリズムとPythonの勉強に忙しいので、暇な時間に急いで説明を書きます.私があなたを助けることができることを望んで、感謝します.
ソースコード

function MyPromise(executor) {
    var self = this
    self.status = 'pending'
    self.onResolvedCallback = []
    self.onRejectedCallback = []

    function resolve(value) {
        setTimeout(function () { //            
            if (self.status === 'pending') {
                self.status = 'resolved'
                self.data = value
                for (var i = 0; i < self.onResolvedCallback.length; i++) {
                    self.onResolvedCallback[i](value)
                }
            }
        })
    }

    function reject(reason) {
        setTimeout(function () { //            
            if (self.status === 'pending') {
                self.status = 'rejected'
                self.data = reason
                for (var i = 0; i < self.onRejectedCallback.length; i++) {
                    self.onRejectedCallback[i](reason)
                }
            }
        })
    }

    try {
        executor(resolve, reject)
    } catch (reason) {
        reject(reason)
    }
}

MyPromise.prototype.then = function (onResolved, onRejected) {
    var self = this
    var promise2
    onResolved = typeof onResolved === 'function' ? onResolved : function (v) {
        return v
    }
    onRejected = typeof onRejected === 'function' ? onRejected : function (r) {
        throw r
    }

    if (self.status === 'resolved') {
        return promise2 = new MyPromise(function (resolve, reject) {
            setTimeout(function () { //     onResolved
                try {
                    var x = onResolved(self.data)
                    resolve(x)
                } catch (reason) {
                    reject(reason)
                }
            })
        })
    }

    if (self.status === 'rejected') {
        return promise2 = new MyPromise(function (resolve, reject) {
            setTimeout(function () { //     onRejected
                try {
                    var x = onRejected(self.data)
                    resolve(x)
                } catch (reason) {
                    reject(reason)
                }
            })
        })
    }

    if (self.status === 'pending') {
        //            ，           resolve reject  ， resolve reject            ，        
        return promise2 = new MyPromise(function (resolve, reject) {
            self.onResolvedCallback.push(function (value) {
                try {
                    var x = onResolved(value)
                    resolve(x)
                } catch (r) {
                    reject(r)
                }
            })

            self.onRejectedCallback.push(function (reason) {
                try {
                    var x = onRejected(reason)
                    resolve(x)
                } catch (r) {
                    reject(r)
                }
            })
        })
    }
}

MyPromise.prototype.catch = function (onRejected) {
    return this.then(null, onRejected)
}

テスト

let myPromise1 = new MyPromise((resolve,reject)=>{
 setTimeout(()=>{ resolve('==resolve==')},100)}).then((v)=>{
    console.log('  ');
    console.log(v);},(r)=>{
    console.log('  ');
    console.log(r);})
let myPromise2 = new MyPromise((resolve,reject)=>{
 setTimeout(()=>{ reject('==resolve==')},100)}).catch((r)=>{console.log(r)})