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https://missterhao.me/2018/06/26/%e3%80%90nodejs%e3%80%91%e8%87%aa%e5%b7%b1%e7%9a%84-module-%e8%87%aa%e5%b7%b1%e5%81%9a-30%e5%a4%a9%e8%a8%88%e7%95%ab-1/
【NodeJS】自己的 module 自己做--30天計畫 -1