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感觉`非无穷`有些绕口，不如按英文直译来的更清晰

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

The Number.isFinite() method determines whether the passed value is a finite number.
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@ -33,9 +33,9 @@ Number('0o10') // 8
## Number.isFinite(), Number.isNaN()
ES6在Number对象上，新提供了`Number.isFinite()`和`Number.isNaN()`两个方法，用来检查`Infinite`和`NaN`这两个特殊值。
ES6在Number对象上，新提供了`Number.isFinite()`和`Number.isNaN()`两个方法。
`Number.isFinite()`用来检查一个数值是否非无穷（infinity）。
`Number.isFinite()`用来检查一个数值是否为有限的（finite）。
```javascript
Number.isFinite(15); // true