要在登录后和登录前显示不同的抽屉项目

Question

I have a react navigation drawer i want to show some drawer items like profile,wishlist,logout only for login user and some items like about,contact etc..for guest user without login..and show name of login user in drawer 
//main drawer
const MainNavigator=createDrawerNavigator(
 {

// scenennavigator包含所有屏幕         主页：{screen：ScreensNavigator}，         愿望清单：拍卖愿望清单，         个人资料：profilenewscreen，          关于：AboutApp，          联系人：Contactcompany，
    }，     {         contentComponent :(道具）=>         {           让userData = {};           AsyncStorage.getItem（“ user”）。then（async（user）=> {             console.log（“用户”，用户）             userData = JSON.parse（用户）             //console.log("userid*************",userData.id）
        }）;             返回（                                                                                       {}                                                                                                                            Alert.alert（                     '登出'，                     “您要注销吗？”，                     [                       {text：'Cancel'，onPress：（）=> {return null}}，                       {text：'Confirm'，onPress：（）=> {                         AsyncStorage.clear（）;                         props.navigation.navigate（'Loginwindow'）                       }}，                     ]，                     {可取消：假}                   ）
                }>                   登出                                  

    </SafeAreaView>)
    },
    drawerWidth:300,
}
);
export default createAppContainer(MainNavigator)   ;