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JS中的null和undefined,undefined为啥用void 0代替?
source link: https://juejin.im/post/5cc58a72e51d456e845b4289
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起因 某天,在看某位同学的js代码,代码中发现了一个奇怪的东西 void 0,虽然第一眼看不懂这是什么东西,但是根据上下文,这里应该是想判断是否等于undefined,为什么要这样写的,有什么渊源吗?顺便就把undefined和null都拿出来复习了一下.
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