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schangxiang@126.com
2025-09-19 18966e02fb573c7e2bb0c6426ed792b38b910940
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# number-is-nan [![Build Status](https://travis-ci.org/sindresorhus/number-is-nan.svg?branch=master)](https://travis-ci.org/sindresorhus/number-is-nan)
 
> ES2015 [`Number.isNaN()`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Number/isNaN) [ponyfill](https://ponyfill.com)
 
 
## Install
 
```
$ npm install --save number-is-nan
```
 
 
## Usage
 
```js
var numberIsNan = require('number-is-nan');
 
numberIsNan(NaN);
//=> true
 
numberIsNan('unicorn');
//=> false
```
 
 
## License
 
MIT © [Sindre Sorhus](http://sindresorhus.com)