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浅谈 instanceof 和 typeof 的实现原理
source link: https://juejin.im/post/5b0b9b9051882515773ae714
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typeof 实现原理 typeof 一般被用于判断一个变量的类型，我们可以利用 typeof 来判断number, string, object, boolean, function, undefined, symbol 这七种类型，这种判断能帮助
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