NaN为什么不是有限的? [英] Why isn't NaN finite?

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测试isFinite函数，我发现NaN是一个无限数字(即使它不是一个数字 :-)).

Testing the isFinite function I see that NaN is an infinite number (even if it's not a number :-)).

isFinite(NaN) // returns false

这背后的逻辑是什么?为什么NaN不是有限的?

What's the logic behind this? Why isn't NaN finite?

正如戴夫·牛顿(Dave Newton)所说，NaN不是数字，因此您必须考虑它不是有限的也不是无限的. 这些事情也会发生同样的事情:

As Dave Newton said, NaN is not a number, and then you have to consider that it isn't finite nor infinite. The same occurs to these:

NaN > 0  // false
NaN < 0  // false

您可能想阅读以下文章:

You might want to read these articles:

https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/NaN
https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/isFinite

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NaN为什么不是有限的? [英] Why isn&#39;t NaN finite?