复制
1const async1 = async () => {
2  console.log('async1');
3  setTimeout(() => {
4    console.log('timer1')
5  }, 2000)
6  await new Promise(resolve => {
7    console.log('promise1')
8  })
9  console.log('async1 end')
10  return 'async1 success'
11} 
12console.log('script start');
13async1().then(res => console.log(res));
14console.log('script end');
15Promise.resolve(1)
16  .then(2)
17  .then(Promise.resolve(3))
18  .catch(4)
19  .then(res => console.log(res))
20setTimeout(() => {
21  console.log('timer2')
22}, 1000)
23