1、events的使用

需要使用命令添加events库 yarn add events
1、初始化实例对象const events = new EventEmitter()
2、添加事件监听events. addListener("events_name", this.handleEventMessage);
3、移除事件监听events.removeListener("events_name", this.handleEventMessage);

import React, { PureComponent } from 'react'
import {EventEmitter} from 'events'

const events = new EventEmitter()
class Home extends PureComponent {
    constructor(props) {
        super(props);
    }
    componentDidMount() {
        events.addListener("sayHello", this.handleEventMessage);
    }

    componentWillUnmount() {
        events.removeListener("sayHello", this.handleEventMessage);
    }
    render() {
        return (
            <div>
                Profile
            </div>
        )
    }

    handleEventMessage(args) {
        console.log(args + "hello");
    }
}

class Profile extends PureComponent {
    render() {
        return (
            <div>
                Profile
                <button onClick={e =>this.sendEvent()}>点击发送消息</button>
            </div>
        )
    }

    sendEvent() {
        console.log("发送消息")
        events.emit("sayHello", "123");
    }
}

export default class App extends PureComponent {
    constructor(props) {
        super(props);
    }
    render() {
        return (
            <div>
                <Profile />
                <Home />
            </div>
        )
    }
}