## isNil + [link](./isNil "Link to this entry.") + [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L10131 "View in source.") + [npm](https://www.npmjs.com/package/lodash.isnil "See the npm package.") ``` _.isNil(value) ``` 检查 `value` 是否是 `null` 或者 `undefined`。 ### 参数 1. value (\*) 要检查的值 ### 返回值 (boolean) 如果是 `null` 或者 `undefined` 返回 `true`，否则返回 `false` ### 示例 ``` _.isNil(null); // => true _.isNil(void 0); // => true _.isNil(NaN); // => false ```