Number.NaN

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Number.NaN 静态数据属性表示非数字值,等同于 NaN。有关 NaN 的行为的更多信息,请参阅全局属性的描述

尝试一下

function clean(x) {
  // eslint-disable-next-line use-isnan
  if (x === Number.NaN) {
    // Can never be true
    return null;
  }
  if (isNaN(x)) {
    return 0;
  }
}

console.log(clean(Number.NaN));
// Expected output: 0

数字值 NaN

Number.NaN 的属性特性
可写
可枚举
可配置

描述

由于 NaNNumber 的静态属性,你应该始终将其用作 Number.NaN,而不是作为一个数字值的属性。

示例

检查值是否为数字

js
function sanitize(x) {
  if (isNaN(x)) {
    return Number.NaN;
  }
  return x;
}

规范

Specification
ECMAScript® 2025 Language Specification
# sec-number.nan

浏览器兼容性

Report problems with this compatibility data on GitHub
desktopmobileserver
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
Deno
Node.js
NaN

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support

参见