Describe
Element components style extension
Use
```javascript
import elextend from 'element-css-extension'
elextend()
```
elextend argument options(optional)
options: {
includes: [],
excludes: [],
}
Explain
button: 扩展type in ['main','minor','risk']
checkbox: 扩展按钮组类型class: vul-checkbox, 覆盖了交互样式
input: 覆盖了交互样式
radio: 扩展按钮组类型class: vul-radio, 覆盖了交互样式
select: 覆盖了下拉弹出框样式及交互样式
Changelog
1.0.0: init
1.0.1: add ['button','checkbox','input','radio','select']
1.0.2: rebuild
1.0.3: test