react中异步组件以及withRouter的使用

//首先要下载yarn add react-loadable
//loadable.js文件
import React from 'react';
import Loadable from 'react-loadable';

const LoadableComponent = Loadable({
  loader: () => import('./'),  //./需要异步的组件
  loading(){
    return <div>正在加载</div>
    //可以加载一些好看的loading
  }
});

export default () => <LoadableComponent/>;

//index.js文件
import React, { Component } from 'react';
import { withRouter } from 'react-router-dom';
import { connect } from 'react-redux';

class Detail extends Component{
    render(){
        console.log(this.props.match.params.id);  //这时候就可以获取到了，页面也不会报错了
        return(<div></div>);
    }
}
export default connect(mapState, mapDispatch)(withRouter(Detail));


//路由部分
import React, { Component } from 'react';
import { BrowserRouter, Route } from 'react-router-dom';
import { Provider } from 'react-redux';
import store from './store';
import Detail from './pages/detail/loadable.js';
class App extends Component{
    render(){
        return(
            <Provider store={store}>
                <BrowserRouter>
                    <div>
                        <Route path='/detail/:id' exact component={Detail}></Route>
                    </div>
                </BrowserRouter>
            </Provider>
        );
    }
}