问题描述
在我看来，代码
console.log(1 / 0)
应该返回 NaN，但它返回的是 Infinity.但是这段代码:
should return NaN, but instead it returns Infinity. However this code:
console.log(0 / 0)
确实返回NaN.有人可以帮我理解这个功能的原因吗?在 x/0 where x !== 0
does return NaN. Can someone help me to understand the reasoning for this functionality? Not only does it seem to be inconsistent, it also seems to be wrong, in the case of x / 0 where x !== 0
推荐答案
因为浮点数是这样定义的(更普遍的不仅仅是 Javascript).例如:
Because that's how floating-point is defined (more generally than just Javascript). See for example:
粗略地说，您可以将 1/0 视为 1/x 的极限，因为 x 趋于零(从右侧开始).而 0/0 根本没有合理的解释，因此是 NaN.
Crudely speaking, you could think of 1/0 as the limit of 1/x as x tends to zero (from the right). And 0/0 has no reasonable interpretation at all, hence NaN.
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