复制
1import { useState } from 'react';
2
3export default function Counter() {
4  const [age, setAge] = useState(42);
5  function increment() {
6    setAge(age + 1); 
7  }
8  return (
9    <>
10      <h1>Your age: {age}</h1>
11      <button onClick={() => {
12        increment();
13        increment();
14        increment();
15      }}>+3</button>
16    </>
17  );
18}
19