Button 示例:

```js
<Button btnType="delete">delete</Button> <br/><br/>
<Button btnType="middle">middle</Button> <br/><br/>
<Button btnType="large">large</Button> <br/><br/>
<Button btnType="default">default</Button> <br/><br/>
<Button btnType="confirm">confirm</Button> <br/><br/>
<Button btnType="small">small</Button>
```