async function async1() { console.log("async1 start"); await async2(); console.log("async1 end"); setTimeout(() => { console.log('timer1') }, 0) } async function async2() { setTimeout(() => { console.log('timer2') Promise.resolve().then(() => { console.log('1---'); }) }, 0) console.log("async2"); } async1(); setTimeout(() => { console.log('timer3') }, 0) console.log("start") 输出： async1 start async2 start async1 end timer2 1--- timer3 timer1
