react native路由跳转怎么实现

import { createStackNavigator, createAppContainer } from "react-navigation";
import { Login } from "./js/pages/login";
import { ScanDevice } from "./js/pages/scanDevice";

const AppNavigator = createStackNavigator({
    Login: {
        screen:Login,
        navigationOptions: {
            title: '冷链物流助手',
            headerTitleStyle:{
                textAlign: 'center',
                flex:1,
            }
        }
    },
    ScanDevice: {
        screen:ScanDevice,
        navigationOptions: {
            title: '扫描设备',
            headerTitleStyle:{
                textAlign: 'center',
                marginLeft:-25,
                flex:1,
            }
        }
    },
},{
    initialRouteName: 'Login'
});

const AppContainer = createAppContainer(AppNavigator);
export default class App extends React.Component {
    render() {
        return <AppContainer />;
    }
}