react v-18父组件调用子组件的方法和数据

版本

"react": "^18.1.0",
"react-dom": "^18.1.0",

父组件

import React, { useState, useRef, memo, useEffect } from "react";
import { useTranslation } from "react-i18next";
import { Card } from "antd";import Childdren from './child/child';
function Dashboard() {let childRef:any = useRef(null);const handleClick = () => {console.log('子组件：', childRef.current)  //打印：{num: 999, add: ƒ}childRef.current.add() //调用}return (<Card style={{ minHeight: "calc(100vh - 64px)" }}><Childdren ref={childRef} title={'我是父组件的数据'} num={123} fun={() => alert('传递了一个函数')} /><button onClick={handleClick}>父组件调子组件方法</button></Card>);
}export default Dashboard;

子组件 (通过useImperativeHandle() 抛出）

// props （类组件则使用this.props）
import React, { useImperativeHandle } from "react";
const Childdren = React.forwardRef((props:any, ref) => {useImperativeHandle(ref,() => ({ add,num }) //父组件通过ref获取值，要在这里抛出);const num = 999;const add = () => {console.log('我是子组件方法')};return (<div><h1>父传子：{props.title}</h1><button >这是子组件</button></div>);
});
export default Childdren;