프로미스, async, awaitasync & await : https://ko.javascript.info/async-awaithttps://ko.javascript.info/async-await ← 추천https://programmingsummaries.tistory.com/325https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Operators/await 비동기 처리NameTags동기와 비동기콜백지옥promiseasync & awaitPromise.allPromise.allSettledES2020Promise.anyES2021