注意：①需使用hooks函数组件        ②使用了antDesign组件库（可不用）

如何使用

父组件代码

import React, { useState, useRef, useEffect } from 'react';
import { Button } from 'antd';
import Child from './components/child';

export default () => {
  const childRef = useRef();

  //使用ref调用子组件的方法
  const handleOpen = () => {
    childRef.current.showModal('Hello word');
  };
  return (
    <div>
      <Button type="primary" onClick={handleOpen}>
        点我
      </Button>
      <Child ref={childRef} />
    </div>
  );
};

子组件代码

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

const ChildComponent = forwardRef((props, ref) => {
  const [isModalOpen, setIsModalOpen] = useState(false);
  const [data, setData] = useState('');

  //弹框打开
  const showModal = async (data) => {
    setIsModalOpen(true);
    setData(data);
  };
  //弹框确定
  const handleOk = async () => {
    setIsModalOpen(false);
  };
  //弹框取消
  const handleCancel = () => {
    setIsModalOpen(false);
  };
  // 通过第二个参数ref来控制暴露哪些方法
  useImperativeHandle(ref, () => ({
    showModal,
  }));

  return (
    <div>
      <Modal title="子组件" width={800} open={isModalOpen} onOk={handleOk} onCancel={handleCancel}>
        <div>{data}</div>
      </Modal>
    </div>
  );
});

export default ChildComponent;

注：本人前端小白 ，如有不对的地方还请多多指教