复制
1async function async1() {
2  console.log("async1 start");
3  await async2();
4  console.log("async1 end");
5  setTimeout(() => {
6    console.log('timer1')
7  }, 0)
8}
9async function async2() {
10  setTimeout(() => {
11    console.log('timer2')
12  }, 0)
13  console.log("async2");
14}
15async1();
16setTimeout(() => {
17  console.log('timer3')
18}, 0)
19console.log("start")
20