react函数式组件ref形式子向父传参

父组件引入useRef

 import { useState, useEffect, useContext, useRef } from 'react';
 const sonRef = useRef(null)

return (
    <div>
        <Son ref={sonRef} onClick={handleClickO} count={count}></Son>
     </div>
       
);

function handleClickO(e) {

console.log(e, 'eeeeeeeeeeeeee');

console.log(sonRef, 'sonRef');

}

子组件触发

import { useImperativeHandle, forwardRef } from "react";
function Son(params, ref) {
    const childFunction = () => {
        console.log('子组件函数被调用');
    };

    // 将子组件的函数暴露给父组件通过 ref 获取
    useImperativeHandle(ref, () => ({
        childFunction,
    }));

    return (
        <div>
            {params.count}
            <button>
                Clicked {count} Son times
            </button>
        </div>
    )
}
export default forwardRef(Son);