import {    AppRegistry,    StyleSheet,    Text,    View,    Platform,    NativeAppEventEmitter,    DeviceEventEmitter,} from 'react-native';//添加DeviceEventEmittercomponentDidMount() {    if(Platform.OS=='android'){        this.subscription = DeviceEventEmitter.addListener('userNameDidChange',(userName) => {        alert('通知');    })    }else {        this.subscription = NativeAppEventEmitter.addListener('userNameDidChange',(userName) => {        alert('通知');    })    }},移除DeviceEventEmittercomponentWillUnmount() {    // 移除    this.subscription.remove();},发送通知DeviceEventEmitter.emit('userNameDidChange', '通知来了');OK, 完成!