DeviceEventEmitter RN事件派发

A页面

import {DeviceEventEmitter} from 'react-native'

//...
if(***){
    DeviceEventEmitter.emit('eventName',param)
}

B页面

import {DeviceEventEmitter} from 'react-native'

// ...

componentDidMount(){
    this.event = DeviceEventEmitter.addListener('eventName',function)
}

componentWillUnmount(){
    this.event.remove()
}