content: import { mount } from 'enzyme'
  import App from 'components/app'
  import Impress from 'components/show/impress'
  import React from 'react'
  const AppMap = {
    App,
    Impress
  }
  let appWrapper
  export default function(appNm){
    let TheApp = AppMap[appNm]
    appWrapper && appWrapper.unmount()
    appWrapper = mount(<TheApp />, { attachTo: document.getElementById('app') })
    return appWrapper
  }
  