Knowledge to learn

1. 事件循环相关题目--必考（一般是代码输出顺序判断）

setTimeout(function () {
  console.log("1");
}, 0);
async function async1() {
  console.log("2");
  const data = await async2();
  console.log("3");
  return data;
}
async function async2() {
  return new Promise((resolve) => {
    console.log("4");
    resolve("async2的结果");
  }).then((data) => {
    console.log("5");
    return data;
  });
}
async1().then((data) => {
  console.log("6");
  console.log(data);
});
new Promise(function (resolve) {
  console.log("7");
  //   resolve()
}).then(function () {
  console.log("8");
});

//输出结果：247536 async2 的结果 1