參考例子：https://blog.csdn.net/weixin_38647954/article/details/138500637
以下是練習(xí)題
console.log(1);
setTimeout(function () {
console.log(2);
let promise = new Promise(function (resolve, reject) {
console.log(3);
resolve();
}).then(function () {
console.log(4);
});
}, 1000);
setTimeout(function () {
console.log(5);
let promise = new Promise(function (resolve, reject) {
console.log(6);
resolve();
}).then(function () {
console.log(7);
});
}, 0);
let promise = new Promise(function (resolve, reject) {
console.log(8);
resolve()
}).then(function () {
console.log(9);
}).then(function () {
console.log(10)
});
console.log(11);
//執(zhí)行順序：1 8 11 9 10 5 6 7 2 3 4
