react-非父组件通信的三种方式

切换列表底部的详情内容修改
非父组件通信可以用三种方式实现非父组件通信-状态提升，开发-订阅模式，context方案。具体如下实现代码如下：

1.非父组件通信-状态提升

（1）父组件

import React, { Component } from 'react'
import axios from 'axios'
import ReasonLi from './components/ReasonLi'
import ReasonDetails from './components/ReasonDetails'
import './css/index.css'
export default class app extends Component {
    state = {
        "titleCn": "",
        "titleEn": "",
        "list": [],
        "info": ""
    }
    constructor() {
        super()
        axios.get("/test.json").then(res => {
            this.setState({
                "titleCn": res.data[0].titleCn,
                "titleEn": res.data[1].titleEn,
                "list": res.data[2].list
            })

        })
    }
    render() {
        return (
            <div className="w-warp">
                <div className="business-why">
                    <h4 className="business-h4">{this.state.titleCn}</h4>
                    <h5 className="business-h5">{this.state.titleEn}</h5>
                    <div className='business-ul'>
                        {
                            this.state.list.map((item, index) =>
                                <ReasonLi key={index} {...item} onEvent={(value) =>
                                    this.setState({
                                        info:value
                                    })
                                }></ReasonLi>
                            )
                        }
                    </div>
                    <ReasonDetails content={this.state.info} />
                </div>
            </div>
        )
    }
}

(2)子组件 列表

import React, { Component } from 'react'
import './../css/index.css'
export default class ReasonLi extends Component {
    render() {
        let {name,url,content}=this.props
    return (
        <div className='business-product' onClick={() => { this.props.onEvent(content) }}>
            <div className='business-img'><img src={url} alt={name} /></div>
            <h5>{name}</h5>
      </div>
    )
  }
}

(3)子组件 详情

import React, { Component } from 'react'
import './../css/index.css'
export default class app extends Component {
    render() {
        let {content}=this.props
    return (
      <div className='business-product-details' >
           {content}
      </div>
    )
  }
}

(4)index.css

h4,h5,h6{padding:0;margin:0;}
.w-warp {
    width: 1200px;
    margin: 0px auto;
}
.business-why {
    background: #f2f2f2;
    padding: 40px 0;
    margin: 50px auto;
}
.business-h4 {
    text-align: center;
    font-size: 40px;
    color: #484848;
    font-family: "黑体";
    font-weight: normal;
    margin-top: 20px;
}

.business-h5 {
    text-align: center;
    font-size: 16px;
    color: #999;
    font-weight: normal;
    margin-bottom: 30px;
    margin-top: 10px;
}
.business-h6 {
    text-align: center;
    font-size: 14px;
    color: #999;
    font-weight: normal;
    margin-bottom: 10px;
    line-height: 1.5em;
}
.business-ul {
    display: flex;
    padding-left: 40px;
    padding-top: 30px;
    padding-bottom: 30px;
}

.business-product {
    flex: 1;
    background: #fff;
    margin-right: 40px;
    cursor: pointer;
    transition: 1s ease;
}

.business-product h5 {
    color: #00ab84;
    font-size: 16px;
    text-align: center;
    margin-top: 10px;
    margin-bottom:10px;
}

.business-product-details {
    background: #f2f2f2;
    padding: 40px 0;
    color: #333333;
    font-size: 14px;
    padding: 10px;
    line-height: 2em;
    text-indent: 2em;
}

.business-img {
    width: 250px;
    height: 280px;
}

.business-img img {
    width: 100%;
}
.business-product:hover {
    transform: scale(1.2);
    opacity: 0.8;
    background: #00ab84;
    color: #fff;
}

.business-product:hover h5 {
    color: #fff;
}

.business-product:hover p {
    color: #fff;
}

(4)test.json 可以放到public公共文件夹

[
    {"titleCn":"为什么选择美品多？" },
    {"titleEn":"Why DO YOU CHOOSE MEIPINDUO?"},
    {"list": [
                {
                    "name": "成熟的系统工具",
                    "url": "https://www.meipinshu.com/images/business/bussiness-pro1.png",
                    "content": "美品树具备一套完整成熟的B2B2C信息化系统工具，ERP+WMS+分销系统+直播系统+业务管理系统，支持2B、2C、直播等技术，可为合作商做好销售工具的有力支持"
                },
                {
                    "name": "强大的金融支持",
                    "url": "https://www.meipinshu.com/images/business/bussiness-pro2.png",
                    "content": " 义乌美品树具备国资数亿元专项金融资金优势，可为广大合作商提供低息、高额的专项经营性资金"
                },
                {
                    "name": "品牌升级服务",
                    "url": "https://www.meipinshu.com/images/business/bussiness-pro3.png",
                    "content": " 在美品树强大的商品、市场、技术、金融支持下，可助合作商快速进行渠道巩固、商品品类丰富、商品品牌升级、自身服务品牌加强等"
                },
                {
                    "name": "一站式优选供应链",
                    "url": "https://www.meipinshu.com/images/business/bussiness-pro4.png",
                    "content": "义乌商城集团产业链强大的商业支持下，美品树具备极强的商品供应链优势，可一站式供应日百系列，满足合作商家日百品类补充"
                }
        ]
    }
]

2. 非父组件通信-订阅发布模式

import React, { Component } from 'react'
import axios from 'axios'
import './css/index.css'
//调度中心
var bus = {
    list:[],
    //订阅
    subscribe(callback) {
        this.list.push(callback)
    },
    //发布
    publish(text) {
        //遍历所以的list,将回调函数执行
        this.list.forEach(callback => {
            callback &&callback(text)
        })
    }
}
class ReasonLi extends Component {
    render() {
        let {name,url,content}=this.props
    return (
        <div className='business-product' onClick={() => { bus.publish(content); }}>
            <div className='business-img'><img src={url} alt={name} /></div>
            <h5>{name}</h5>
      </div>
    )
  }
}
class ReasonDetails extends Component {
    state = {
        info:""
    }
    constructor() {
        super()
        bus.subscribe((value) => {
            this.setState({info:value})
        })
    }
    render() {
        let {content}=this.props
    return (
      <div className='business-product-details' >
           {this.state.info}
      </div>
    )
  }
}
export default class app extends Component {
    state = {
        "titleCn": "",
        "titleEn": "",
        "list": []
    }
    constructor() {
        super()
        axios.get("/test.json").then(res => {
            this.setState({
                "titleCn": res.data[0].titleCn,
                "titleEn": res.data[1].titleEn,
                "list": res.data[2].list
            })

        })
    }
    render() {
        return (
            <div className="w-warp">
                <div className="business-why">
                    <h4 className="business-h4">{this.state.titleCn}</h4>
                    <h5 className="business-h5">{this.state.titleEn}</h5>
                    <div className='business-ul'>
                        {
                            this.state.list.map((item, index) =>
                                <ReasonLi key={index} {...item} ></ReasonLi>
                            )
                        }
                    </div>
                    <ReasonDetails />
                </div>
            </div>
        )
    }
}

3. 非父组件通信-context方案也叫跨组件通信

import React, { Component } from 'react'
import axios from 'axios'
import './css/index.css'
const GlobalContext = React.createContext()
export default class app extends Component {
    state = {
        "list": [],
        'info':""
    }
    constructor() {
        super()
        axios.get("/test.json").then(res => {
            this.setState({
                "list": res.data[2].list
            })

        })
    }
    render() {
        return (
            <GlobalContext.Provider value={{
                info: this.state.info, changeInfo: (value) => {
                    this.setState({
                        info:value
                    })
                }
            }}>
                <div className="w-warp">
                    <div className="business-why">
                        <div className='business-ul'>
                            {
                                this.state.list.map((item, index) =>
                                    <ReasonLi key={index} {...item} ></ReasonLi>
                                )
                            }
                        </div>
                        <ReasonDetails />
                    </div>
                </div>
            </GlobalContext.Provider>
        )
    }
}

class ReasonLi extends Component {
    render() {
        let { name, url, content } = this.props
        return (
            <GlobalContext.Consumer>
                {
                    (value) => {
                        return <div className="business-product" onClick={() => { value.changeInfo(content); }}>
                            <div className='business-img'><img src={url} alt={name} /></div>
                            <h5>{name}</h5>
                        </div>
                    }
                }

            </GlobalContext.Consumer>
        )
    }
}
class ReasonDetails extends Component {
    constructor() {
        super()
    }
    render() {
        let { content } = this.props
        return (
            <GlobalContext.Consumer>
                {
                    (value) => <div className='business-product-details' >
                       {value.info}
                    </div>
                }
            </GlobalContext.Consumer>
            
        )
    }
}