1.安装router

cnpm install --save react-router

2.安装react-router-dom

cnpm install react-router-dom --save-dev

3.在src下创建route文件夹，文件夹内创建index.js;

import React from 'react'
import {HashRouter,Route,Switch,Redirect} from 'react-router-dom';
import Index from '../index/index'
import ClassCom from '../components/ClassCom'
class RouterConfig extends React.Component{
    render() {
        return(
            <HashRouter>
                <Switch>
                    <Route exact path="/" component={Index} />
                    <Route  exact path="/ClassCom" component={ClassCom} />
                </Switch>    
            </HashRouter>
        )
    }
}
export default RouterConfig

4.在入口文件(index.js)引入路由配置文件

import React from 'react';
import ReactDOM from 'react-dom';
import RouterConfig from './Router/index';
import reportWebVitals from './reportWebVitals';//导入优化性能组件
ReactDOM.render(
  // 提示
  <React.StrictMode>
    <RouterConfig />
  </React.StrictMode>,
  document.getElementById('root')
);
reportWebVitals();//优化性能