详解React hooks组件通信方法

//子组件
const Child = ({ param1, param2 }) => {
  return <>父组件传递的参数：{param1},{param2}</>
}

//父组件
const Parent = () => {
  return <Child //子组件
    params1="1"
    params2="2"
  />
}

import React, { useRef, useImperativeHandle, useEffect, forwardRef } from 'react';

//父组件

const Parent = () => {//父组件
  const ref = useRef(); //ref
  useEffect(() => {
    console.log(ref)
  }, [])
  return (
    <Child //子组件
      ref={ref} //将ref传递给子组件
    />)
}

//子组件
const Child = forwardRef(({ },ref) => {
  useImperativeHandle(ref, () => ({
    data: '我是子组件'
  }));
  return <>我是子组件</>
})

const Parent = () => {
  return <Child1 //子组件
    param1="1"
    param2="2"
  />
}
//子组件
const Child1 = ({ param1, param2 }) => {
  return <Child2 param1={param1} param2={param2} />
}
//子子组件
const Child2 = ({ param1, param2 }) => {
  return <>父组件传递的参数：{param1},{param2}</>
}

import { createContext } from 'react'
const myContext = createContext(null)
export default myContext

import React, { useContext } from 'react';
import myContext from './context'

const Parent = () => {
  //使用Provider传递值
  return <myContext.Provider value={{ param1: "1", param2: "2" }}>
    <Child1 />
  </myContext.Provider>
}

//子组件无需改动
const Child1 = () => {
  return <Child2 />
}
//子子组件
const Child2 = () => {
  //通过useContext获取父组件的值
  const { param1, param2 } = useContext(myContext)  
  return <>父组件传递的参数：{param1},{param2}</>
}