复制
1async function async1 () {
2  console.log('async1 start');
3  await new Promise(resolve => {
4    console.log('promise1')
5  })
6  console.log('async1 success');
7  return 'async1 end'
8}
9console.log('srcipt start')
10async1().then(res => console.log(res))
11console.log('srcipt end')
12