简述异步笔试题请写出下面代码的运行结果 ？
async function async1() {
console.log('async1 start')
await async2()
console.log('async1 end')}async function async2()
{
console.log('async2')}console.log('script
start')setTimeout(function()
{
console.log('setTimeout')},
0) async1()new Promise(function(resolve)
1) {
console.log('promise1')
resolve()}).then(function()
{
console.log('promise2')})console.log('script end'