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 ) {
console.log('promise1')
resolve();
} ).then( function() {
console.log('promise2')
} )
//执行结果
/*
script start
async1 start
async2
promise1
async1 end
promise2
Promise {<fulfilled>: undefined}
setTimeout
*/
