A button means an operation(or a series of operations). Click a button will trigger corresponding business logic.
## API
To get a customized button, just set `type`/`shape`/`size`/`loading`/`disabled`.
Property | Description | Type | Default
-----|-----|-----|------
type | can be set as `primary``ghost` or nothing | string | -
htmlType | to set the original `type` of `button`, see: [MDN](https://developer.mozilla.org/en-US/docs/Web/HTML/Element/button#attr-type) | string | `button`
icon | set the icon of button, see: Icon component | string | -
shape | can be set as `circle``circle-outline` or nothing | string | -
size | can be set as `small``large` or nothing | string | `default`
loading | to set the loading status of button | boolean | false
onClick | set the handler to handle `click` event | function | -
`<Button>Hello world!</Button>` will be rendered into `<button>Hello world!</button>`, and all the properties which are not listed above will be transferred to the `<button>` tag.
