引入

import { useState } from "react";

定义

const [count, setCount] = useState(0);

使用

import { useState } from "react";
function Son(params) {const [count, setCount] = useState(0);function handleClick() {setCount(count + 1);}// 父 <Son count={count}></Son>console.log(params, 'paramsparams');return (<div>{params.count}<button onClick={handleClick}>Clicked {count} Son times</button></div>)
}
export default Son;