复制
1const promise = new Promise((resolve, reject) => {
2  console.log(1);
3  setTimeout(() => {
4    console.log("timerStart");
5    resolve("success");
6    console.log("timerEnd");
7  }, 0);
8  console.log(2);
9});
10promise.then((res) => {
11  console.log(res);
12});
13console.log(4);