1. 自我介绍
2. 在工作中遇到的具有挑战性的事
3. react的常用hooks
4. 实现useHandler
5. 事件循环输出题

const A = (props) => {
  const [state,setState] = useState({b:1})
  const handler = useHandler((event) => {
    console.log(props.a);
    console.log(state.b);
  });
  return <button onClick={handler}>click me</button>;
};

// handler 引用稳定不变，每次执行获取到的 props、state 都是最新的

const useHandler = (cb) => {
  
}

async function async1() {
  console.log("async1 start");
  await async2();
  console.log("async1 end");
  Promise.resolve().then(() => {
    console.log("after async1 end");
  });
}

async function async2() {
  console.log("async2");
}
console.log("script start");

setTimeout(() => console.log("setTimeout"), 0);

async1();

new Promise((resolve) => {
  console.log("promise1");
  resolve();
}).then(() => {
  console.log("promise2");
});

console.log("script end");
的输出顺序