我已經在應用程序中將React Router升級到了版本4。但是現在我得到了錯誤Warning: You should not use <Route component> and <Route children> in the same route; <Route children> will be ignored此路由有什么問題？import {    Switch,    BrowserRouter as Router,    Route, IndexRoute, Redirect,    browserHistory} from 'react-router-dom'   render((    <Router history={ browserHistory }>        <Switch>            <Route path='/' component={ Main }>                <IndexRoute component={ Search } />                <Route path='cars/:id' component={ Cars } />                <Route path='vegetables/:id' component={ Vegetables } />            </Route>            <Redirect from='*' to='/' />        </Switch>    </Router>), document.getElementById('main'))