Promiseall和Promiserace实现

Promise.all=(proArr) =>{    return new Promise((resolve, reject) => {        let retsult = []        let count = 0        for (let i = 0; i < proArr.length; i++) {            proArr[i].then(data => {                retsult[i]=data                if(++count===proArr.length){                    resolve(retsult)                }            }, reject)        }    })}

Promise.race=(promiseAry)=> {    return new Promise((resolve, reject) => {      for (let i = 0; i < promiseAry.length; i++) {        promiseAry[i].then(resolve, reject)      }    })  }