Promise题目

setTimeout(function () {

console.log(1);

}, 0)

new Promise(function executor(resolve) {

console.log(2);

for (var i = 0; i < 1000; i++) {

i = 9999 && resolve();

}

console.log(3);

}).then(function () {

console.log(4);

})

console.log(5);

输出结果：2 3 5 4 1