非父子组件传值

one 组件

import React, { Component } from 'react'
import PubSub from 'pubsub-js'

export default class One extends Component {
    render() {
        let cities = [
            {id: 1, name: '深圳'},
            {id: 2, name: '上海'},
            {id: 3, name: '武汉'},
            {id: 4, name: '杭州'}
        ]
        return (
            <div className="one">
                <h1>one组件</h1>
                <ul>
                {
                    cities.map(item=>{
                        return <li key={item.id} onClick={()=>this.selectCityAction(item.name)}>{item.name}</li>
                    })
                }
                </ul>
            </div>
        )
    }

    selectCityAction = (cityName)=>{
        console.log(cityName);
        // 执行发布
        PubSub.publish('select-city', cityName);
    }
}

two组件

import React, { Component } from 'react'
import PubSub from 'pubsub-js'

export default class Two extends Component {
    state = {
        oneData: null
    }
    render() {
        return (
            <div className="two">
                <h1>two组件</h1>
                <p>接收到的数据为：{this.state.oneData}</p>
            </div>
        )
    }

    componentDidMount(){
        // 监听
        this.token = PubSub.subscribe('select-city', (msg, data)=>{
            this.setState({oneData: data});
            console.log(data);
        });
    }

    componentWillUnmount(){
        // 移除监听
        PubSub.unsubscribe(this.token);
    }
}

App组件

import React, { Component } from 'react';
import One from './components/one'
import Two from './components/two'
import './style.css'

class App extends Component {
    state = {
        isShow: true
    }
    render() {
        return (
            <div className="App">
                <One/>
                <input type="checkbox" checked={this.state.isShow} onChange={(ev)=>{
                    this.setState({isShow: ev.target.checked});
                }}/>
                {this.state.isShow && <Two/>}
            </div>
        );
    }
}

export default App;

style样式

.App{
    padding: 20px;
    background: lavender;
}
.one{
    padding: 50px;
    background: lightblue;
}
.two{
    padding: 50px;
    background: lightcoral;
}