[TOC] ### 1. 引入 ~~~ import { useState } from 'react'; ~~~ ### 2. 在函数中使用 ~~~ function Example() { const [count, setCount] = useState(0); return ( <div> <p>You clicked {count} times</p> <button onClick={() => setCount(count + 1)}> Click me </button> </div> ); } ~~~