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#출처: http://www.tcpschool.com/ajax/ajax_intro_basic
#출처:https://haileychoi15.medium.com/%EC%9E%90%EB%B0%94%EC%8A%A4%ED%81%AC%EB%A6%BD%ED%8A%B8%EB%8A%94-%EC%96%B4%EB%96%BB%EA%B2%8C-%EB%8F%99%EC%9E%91%ED%95%98%EB%82%98%EC%9A%94-f3d07a529e41
#참조:https://studiomeal.com/archives/533
#출처:https://www.nextree.co.kr/p8468/
#출처:http://www.tcpschool.com/javascript/js_operator_assignment
#출처:https://m.post.naver.com/viewer/postView.nhn?volumeNo=6603962&memberNo=15527418
#출처:https://smilejsu.tistory.com/1903