看完这个代码示例就明了了：
异步函数 - 提高 Promise 的易用性 | Web | Google Developersasync/await 入門（JavaScript） - Qiitaasync, await入門 - Qiita // Promise const hoge = value => { return new Promise(resolve => { setTimeout(() => { resolve(value * 2); }, 1000); }) } const fuga = value => { return new Promise(resolve => { setTimeout(() => { resolve(value * 3); }, 500); }) } const promiseAllSample = () => { const promise1 = hoge(5); const promise2 = hoge(10); const promise3 = promise2.then(value => { return fuga(value); }); return Promise.all([promise1, promise2, promise3]); } promiseAllSample().then(([a, b, c]) => { console.log(a, b, c); // => 10 20 60 }); // Async/Await const hoge = value => { return new Promise(resolve => { setTimeout(() => { resolve(value * 2); }, 1000); }) } const fuga = value => { return new Promise(resolve => { setTimeout(() => { resolve(value * 3); }, 500); }) } const promiseAllSample = async () => { const [a, b] = await Promise.all([hoge(5), hoge(10)]); const c = await fuga(b); return [a, b, c]; } promiseAllSample().then(([a, b, c]) => { console.log(a, b, c); // => 10 20 60 });