复制
1async function async1() {
2  console.log("async1 start");
3  await async2();
4  console.log("async1 end");
5}
6
7async function async2() {
8  console.log("async2");
9}
10
11console.log("script start");
12
13setTimeout(function() {
14  console.log("setTimeout");
15}, 0);
16
17async1();
18
19new Promise(function(resolve) {
20  console.log("promise1");
21  resolve();
22}).then(function() {
23  console.log("promise2");
24});
25console.log('script end')
26