Home.js

import React, {Component} from 'react';class Home extends Component {render() {return (<div><div>你好我是组件{parseInt(Math.random()*10)}</div><div>你好我是组件2{parseInt(Math.random()*10)}</div></div>);}
}export default Home;

 app.js

import React from 'react';
import logo from './logo.svg';
import './App.css';
import  Home from './components/Home.js'
function App() {return (<div className="App"><Home></Home></div>);
}export default App;