将更新的值从子组件传递到父组件

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

function ParentComponent() {
  const [value, setValue] = useState('');

  const handleValueChange = (newValue) => {
    setValue(newValue);
  };

  return (
    <div>
      <ChildComponent onValueChange={handleValueChange} />
      <p>父组件的值：{value}</p>
    </div>
  );
}

export default ParentComponent;

// 子组件
import React from 'react';

function ChildComponent({ onValueChange }) {
  const handleChange = (event) => {
    const newValue = event.target.value;
    onValueChange(newValue);
  };

  return (
    <div>
      <input type="text" onChange={handleChange} />
    </div>
  );
}

export default ChildComponent;