iview按需加载组件后样式不加载

Question

import '../../scss/index.scss'
// eslint-disable-next-line
import {Form, FormItem, Modal, CheckboxGroup, Checkbox} from 'iview'

const componentsArr = {
  Form,
  FormItem,
  Modal,
  CheckboxGroup,
  Checkbox
}

Object.keys(componentsArr).forEach(item => {
  Vue.component(item, componentsArr[item])
})