下面是首頁路由的配置class RouterMap extends React.Component {    render() {        return (<BrowserRouter><div>            <Switch>            <Route path='/' exact component={Home}/>             <Route path="/users" component={Users}/>            <Route path='/city' component={City}/>            <Route path='/city2' component={City2}/>            <Route path='/result' component={Result}/>            <Route match='match' path='/dashboard' exact component={Dashboard}/>            <Route path='/dashboard/id'  component={Dashboard200}/>            </Switch>        </div></BrowserRouter>)    }}下面是子路由頁面的配置class Dashboard extends React.Component {    componentDidMount(){        //console.log(this.props)    }    render() {        console.log(this.props)        const match=this.props.match        return (<div>            <div>123</div>            <Switch>                <Route path={`${match.url}/2`} component={Dashboard6}/>                <Route path={`${match.url}/3`} component={Dashboard1}/>                <Route path="/2" component={Dashboard1}/>            </Switch>         </div>)    }}