## 概述

`Number.NaN` 表示“非数字”（Not-A-Number）。和 `NaN` 相同。

不必创建一个 `Number` 实例来访问该属性，使用 `Number.NaN` 来访问该静态属性。

`Number.NaN` 属性的属性特性：
writable | false
enumerable | false
configurable | false

## 规范

Specification | Status | Comment
--- | --- | ---
ECMAScript 1st Edition (ECMA-262) | Standard | Initial definition. Implemented in JavaScript 1.1.
ECMAScript 5.1 (ECMA-262) Number.NaN | Standard |
ECMAScript 2015 (6th Edition, ECMA-262) Number.NaN | Standard |
ECMAScript Latest Draft (ECMA-262) Number.NaN | Draft |

## 浏览器兼容性

We're converting our compatibility data into a machine-readable JSON format. This compatibility table still uses the old format, because we haven't yet converted the data it contains. Find out how you can help!

- Desktop
- Mobile

Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari
--- | --- | --- | --- | --- | ---
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile
--- | --- | --- | --- | --- | --- | ---
Basic support | (Yes) | (Yes) | (Yes) | (Yes) | (Yes) | (Yes)

## 相关链接

- 全局对象 `NaN`
- `Number`