单击父组件从子组件获取数据

// 父组件
import React, { useState } from 'react';
import ChildComponent from './ChildComponent';

function ParentComponent() {
  const [data, setData] = useState('');

  const handleData = (childData) => {
    setData(childData);
  };

  return (
    <div>
      <ChildComponent onData={handleData} />
      <p>Data from child component: {data}</p>
    </div>
  );
}

export default ParentComponent;

// 子组件
import React from 'react';

function ChildComponent(props) {
  const handleClick = () => {
    const data = 'Hello from child component';
    props.onData(data);
  };

  return (
    <button onClick={handleClick}>Click me</button>
  );
}

export default ChildComponent;