async function async1() {console.log('async1 start');await async2();console.log('async1 end');}async function async2() {console.log('async2 start');return new Promise((resolve,reject)=>{resolve();console.log("async2 promise")})}console.log('script start');setTimeout(function () {console.log('setTimeout');}, 0)async1();new Promise(function (resolve) {console.log('promise1');resolve();}).then(function () {console.log('promise2');}).then(function () {console.log('promise3');});console.log('script end');