const first = () => (new Promise((resolve,reject)=>{
console.log(3);
let p = new Promise((resolve, reject)=>{
console.log(7);
setTimeout(()=>{
console.log(5);
resolve(6);
},0)
resolve(1);
});
resolve(2);
p.then((arg)=>{
console.log(arg);
});
}));
first().then((arg)=>{
console.log(arg);
});
console.log(4);
执行结果
图片.png
