isUndefined
最后更新于：2022-04-02 00:03:16
## isUndefined
+ [link](./isUndefined "Link to this entry.")
+ [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L10351 "View in source.")
+ [npm](https://www.npmjs.com/package/lodash.isundefined "See the npm package.")
```
_.isUndefined(value)
```
检查 `value` 是否是 `undefined`.
### 参数
1. value (\*)
要检查的值
### 返回值 (boolean)
如果是正确的类型，返回 `true`，否则返回 `false`
### 示例
```
_.isUndefined(void 0);
// => true
_.isUndefined(null);
// => false
```
';