javascript - 无穷大是javascript中的某个数字吗？

Question

alert(1/0) 警报 Infinity 和 alert(1/-0) 警报 -Infinity . alert(-1/-0) 提醒 Infinity，正如我在使用 实数 进行一些操作时所期望的那样。我不能说无穷大是一个可测量的值。 javascript 是否认为它是某个数字？

Answer 1

是的，Infinity 和-Infinity 是special values of the Number type .来自 ES5 规范:

There are two other special values, called positive Infinity and negative Infinity. For brevity, these values are also referred to for expository purposes by the symbols +∞ and −∞, respectively. (Note that these two infinite Number values are produced by the program expressions +Infinity (or simply Infinity) and -Infinity.)

另请注意，NaN 也是 Number 类型的值，尽管它是“非数字”的首字母缩写词。