node.js - 关于下面代码中的事件循环，nodejs 和浏览器有什么区别？

Question

async function async1() {
    console.log("a");
    await  async2(); 
    console.log("b");
}
async function async2() {
   console.log( 'c');
}
console.log("d");
setTimeout(function () {
    console.log("e");
},0);
async1();
new Promise(function (resolve) {
    console.log("f");
    resolve();
}).then(function () {
    console.log("g");
});
console.log('h');

nodejs 运行时输出:d a c f h b g e

Google 浏览器运行时输出:d a c f h g b e

为什么输出不同的结果？

Answer 1

我认为是因为 NodeJS 有自己的计时器实现:

https://nodejs.org/dist/latest-v9.x/docs/api/timers.html

The timer functions within Node.js implement a similar API as the timers API provided by Web Browsers but use a different internal implementation that is built around the Node.js Event Loop.

关于 Node 中的事件循环:https://nodejs.org/en/docs/guides/event-loop-timers-and-nexttick/