When importing the element ui, you need to introduce the corresponding component in element.js if you choose on-demand import.

import { ElForm } from 'element-plus'
import { ElButton } from 'element-plus'
import { ElFormItem } from 'element-plus'
import { ElInput } from 'element-plus'
import lang from 'element-plus/lib/locale/lang/zh-cn'
import locale from 'element-plus/lib/locale'

export default (app) => {
  locale.use(lang)
  app.use(ElButton)
  app.use(ElForm)
  app.use(ElFormItem)
  app.use(ElInput)
}

The page can be displayed normally

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