[Node.js] promise, async 공부를 위해 참고한 사이트 주소

http://proinlab.com/archives/1811 (제일 참고를 많이 함)

http://yubylab.tistory.com/entry/Nodejs-%EA%B0%9C%EB%B0%9C%EC%8B%9C-%EC%A3%BC%EC%9D%98%EC%82%AC%ED%95%AD-

10%EA%B0%80%EC%A7%80-Top-10-Common-Mistakes

http://forum.falinux.com/zbxe/index.php?document_srl=862481&mid=lecture_tip

http://programmingsummaries.tistory.com/325

https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/Promise

http://bcho.tistory.com/1086

http://bluebirdjs.com/docs/working-with-callbacks.html (최근 Promise 를 사용하는데 제일 인기 있는 모듈)

https://gamecodingschool.org/2015/05/28/%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8%EC%9D%98-%EC%95%BD%EC%86%8Dpromise-2%EB%B6%80-%EB%B9%84%EA%B5%90/

http://hatemogi.com/holiday-project-day-22/

http://yubylab.tistory.com/entry/%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8-Promise-%EC%9D%B4%ED%95%B4%ED%95%98%EA%B8%B0

http://d2.naver.com/helloworld/4994500