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띄어쓰기를 기준으로 '받는사람' '메시지'를 구분했습니다.
userName은 처음 입장할 때, 서버에 저장하고, 메시지를 받는 사람 이름이 서버에 없으면 undefined가 뜨게 했습니다.
on과 emit 개념을 조금 더 깊이 이해할 수 있었습니다
server
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b
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