text: import React from 'react';
  import ReactDOM from 'react-dom';
  import './index.css';
  // 高阶组件
  // import App from './component/Hign-Order-Components/App';
  
  // JSX语法的转化过程
  // import JSX from "./component/JSX"
  
  // 组件的更新和避免不必要的重新渲染 shouldComponentUptate
  // import GrandFather from "./component/JSX/GrandFather"
  
  // 纯组件
  import GrandFather from "./component/ProuComponent/GrandFather"
  ReactDOM.render(
    <GrandFather />,
    document.getElementById('root')
  );
  
  