設計并實現 Promise.race()
返回一個 promise，一旦迭代器中的某個 promise 解決或拒絕，返回的 promise 就會解決或拒絕
效果示例：

const promise1 = new Promise((resolve, reject) => {setTimeout(resolve, 500, 'one'); });const promise2 = new Promise((resolve, reject) => {setTimeout(reject, 100, 'two'); });Promise.race([promise1, promise2]).then((value) => {console.log(value);// Both resolve, but promise2 is faster }); function myPromiseRace(ary) {return new Promise((resolve,reject) => {ary.map(item => {item.then(resolve).catch(reject)})}) }myPromiseRace([promise1, promise2]).then((value) => {console.log(value);// Both resolve, but promise2 is faster }).catch(res => {console.log(res) })

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