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.
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| 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) |