첫 렌더링
리렌더링
참고링크 https://leehyungi0622.github.io/categories/JavaScript/ https://present.do/presentations/6187b87b8eb0d57ea69fd5ac?page=11 https://www.youtube.com/watch?v=sJ14cWjrNis&list=PLgXGHBqgT2TvpJ_p9L_yZKPifgdBOzdVH&index=58