<script type="text/babel" data-type="module">
import React, { StrictMode, useState } from 'react';
import { createRoot } from 'react-dom/client';const ParentComponent = () => {const [message, setMessage] = useState("")//父组件方法，将传递给子组件const handleChildAction = (childMessage) => {setMessage(childMessage)  //效果是接收子组件传来的数据，并修改state}const parentMessage = "Hello I'm a parent component" //传递给子组件的数据return (<div style={{padding: '20px', border: '1px solid Red', width: '400px'}}><p>父组件</p><ChildComponent onAction={handleChildAction} fromParent={parentMessage} /><p>来自子组件的消息：{message}</p></div>)
}const ChildComponent = ({onAction, fromParent}) => {//子组件的方法，效果是调用传递过来的父组件方法，并且修改stateconst handleClick = () => {onAction('我是子组件的消息，我收到了你的消息:' + fromParent)}return (<div style={{padding: '20px', border: '1px solid black', width: '300px'}}><p>子组件</p><button onClick={handleClick}>发送消息给父组件</button></div>)
}const root = createRoot(document.getElementById('root'));
root.render(<StrictMode><ParentComponent /></StrictMode>
);
</script>

需要注意的是，如果是TypeScript，需要指定参数的类型是方法

interface ChildComponentProps {onAction: (message: string) => void; 
}const ChildComponent: React.FC<ChildComponentProps> = ({ onAction }) => {

效果:

点击子组件的按钮后: