[improvement] rename suffixPx to addUnit

src/mixins/checkbox.js

@@ -3,7 +3,7 @@
  */
 import Icon from '../icon';
 import { ChildrenMixin } from './relation';
-import { suffixPx } from '../utils';
+import { addUnit } from '../utils';
 
 export const CheckboxMixin = ({ parent, bem, role }) => ({
   mixins: [ChildrenMixin(parent)],
@@ -65,7 +65,7 @@ export const CheckboxMixin = ({ parent, bem, role }) => ({
     const Children = [
       <div
         class={bem('icon', [this.shape, { disabled: this.isDisabled, checked }])}
-        style={{ fontSize: suffixPx(this.iconSize) }}
+        style={{ fontSize: addUnit(this.iconSize) }}
         onClick={this.onClickIcon}
       >
         {CheckIcon}