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firstfu/Node --undefined用法.js

Created September 9, 2019 06:26
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Node --undefined用法.js
## null 表示無值
## undefined 表示沒有定義的變數
##變數設定為- undefined
bartimer = void 0;
##判斷變數如果不為undefined，則變數設定為undefined
if (typeof bartimer != 'undefined'){
bartimer = void 0;
}
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