console 命令行工具 X clear

console

import React,{Component} from 'react';
import {render} from 'react-dom';


class Header extends Component{
  render(){
    return (`
          <div>
            <h1>react 小书</h1>
          </div>

`)
}
  
render(<Header />,document.querySelector('#root'))

<div id="root"></div>