추후 업로드 예정! (시간이 생길ㄸ ㅐ....)
https://developer.mozilla.org/ko/docs/Learn/JavaScript/Objects/Object_prototypes https://developer.mozilla.org/ko/docs/Learn/JavaScript/Objects/Classes_in_JavaScript#ecmascript_2015_%ED%81%B4%EB%9E%98%EC%8A%A4
