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This article mainly introduces js how to achieve an isNaN function, has a certain reference value, interested friends can refer to, I hope you can learn a lot after reading this article, the following let Xiaobian take you to understand.

Implement an isNaN function by yourself

A feature of the NaN value is taken advantage of here, that is, NaN is the only value in the entire language that is not equal to itself. Therefore, NaN is the only value that makes x! = x true.

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