Function setItem

setItem(key?: string, value?: null | string | number | boolean | object): void
Sets the storage value of the given key
Parameters
- Optionalkey: string
  the key to inspect
- Optionalvalue: null | string | number | boolean | object
  the value to set
Returns void
Author
David Hsing
Example
```
setItem('token', '1234567890');
```