content: import React from 'react'
  import ReactDOM from 'react-dom'
  import App from './App' // 引入组件App
  import '../../assets/styles/timeline.styl'  // 引入css
  import '../../assets/styles/read.styl'
  import '../../assets/styles/Footer.styl'
  import '../../assets/styles/Up.styl'
  ReactDOM.render(
    <App />,
    document.getElementById('app')
  )
  