// 浏览器与Node的事件循环(Event Loop)有何区别?

// https://blog.csdn.net/Fundebug/article/details/86487117

// 关于async/await、promise和setTimeout执行顺序

// https://blog.csdn.net/yun_hou/article/details/88697954

// 1.

console.log('---------- 1. ----------')

async function async1() {

console.log("async1 start");

await async2();

console.log("async1 end");

}

async function async2() {

console.log("async2");

}

console.log("script start");

async1();

console.log("script end");

// 2.

await sleep(1000)

console.log('---------- 2. ----------')

console.log("script start");

let promise1 = new Promise(function (resolve) {

console.log("promise1");

resolve();

console.log("promise1 end");

}).then(function () {

console.log("promise2");

});

setTimeout(function () {

console.log("settimeout 1");

}, 2);

setTimeout(function () {

console.log("settimeout 2");

});

console.log("script end");

// 3.

await sleep(1000)

console.log('---------- 3. ----------')

const dateFrom = Date.now()

let i = 1;

const timer = setInterval(() => {

console.log(i++, Date.now() - dateFrom);

const s = Date.now();

while (Date.now() - s < 300) {}

}, 200);

setTimeout(() => {

clearInterval(timer);

}, 700);

// 4.

await sleep(1000)

console.log('---------- 4. ----------')

let p = [];

(function() {

setTimeout(() => {

console.log('timeout 0');

}, 0);

let i = 0;

for (; i < 3; i++) {

p[i] = function() {

return new Promise(function(resolve) {

console.log(`promise ${i}`);

resolve(`promise ${i * i}`);

})

}

}

})();

async function b() {

console.log('async -1');

}

function a() {

console.log(`async ${p.length}`);

return async function() {

console.log(`async ${p.length}`);

await b();

console.log('async -2')

};

}

p.push(a());

p[1]().then(console.log);

p[3]();