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## isNaN 

+ [link](./isNaN "Link to this entry.") 
+ [source](https://github.com/lodash/lodash/blob/4.5.0正式版/lodash.src.js#L10059 "View in source.") 
+ [npm](https://www.npmjs.com/package/lodash.isnan "See the npm package.")

```
_.isNaN(value)
```

檢查 `value` 是否是 `NaN`.

**注意:** 這個方法不同于 [`isNaN`](https://es5.github.io/#x15.1.2.4) 對 undefind 和 其他非數值返回 true.

### 參數

1.  value (\*)

    要檢查的值

### 返回值 (boolean)

如果符合 `NaN` 返回 `true`，否則返回 `false`

### 示例

```
_.isNaN(NaN);
// => true

_.isNaN(new Number(NaN));
// => true

isNaN(undefined);
// => true

_.isNaN(undefined);
// => false 
```




                    
                
        
                
            
        
                
    
                
    
                
        
                
    
                

                







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