重温react-04

兄弟组件之间通信

兄弟1

import React, { Component } from 'react'
import pubsub from './pubsub'
export default class learnReact01 extends Component {
  render() {
    return (
      <div>我是兄弟1
        <button onClick={this.clickMessage}>向兄弟2发信息</button>

      </div>
    )
  }
  clickMessage=()=>{
    pubsub.publish('message','6666')
  }
}

兄弟2

import React, { Component } from 'react'
import pubsub from './pubsub'
export default class learnReact01 extends Component {
  state = {
    msg: ""
  }
  render() {
    return (
      <div>我是兄弟2
        <div>
          {this.state.msg}
        </div>
      </div>
    )
  }
  componentDidMount() {
    pubsub.subscribe('message', (data) => {
      console.log(data)
      this.setState({
        msg: data
      })
    })
  }
}

react中操纵dom和ref

import React, { Component,createRef } from 'react'
import LearnReact from './learnReact04'
export default class learnReact03 extends Component {
    constructor(props) {
        super(props)
        this.state = {
            name: '张三'
        }
        this.divRef = createRef(null)
        this.learnReactRef = createRef(null)
        this.buttonRef = createRef(null)
    }
  render() {
    return (
      <div>
        <div ref={this.divRef}>我是父组件</div>
        <LearnReact ref={this.learnReactRef} />
        <button ref={this.buttonRef} onClick={this.onclickThisMessage}>点击</button>
      </div>
    )
  }
  componentDidMount() {
      console.log(this.divRef.current);
      console.log(this.learnReactRef.current);
      console.log(this.buttonRef.current);
  }
  onclickThisMessage=()=>{
    this.learnReactRef.current.onclick()
  }
}