关于node.js:for-await-…of-表达式的煎蛋实现小demo

偶然间看到一个小例子：

import { serve } from "https://deno.land/std@0.69.0/http/server.ts"; const s = serve({ port: 8000 }); console.log("http://localhost:8000/"); for await (const req of s) {     req.respond({ body: "Hello Worldn" }); }

查了查资料有了上面这个小demo：

const simulateDelay = (val, delay) =>    new Promise((resolve) => setTimeout(() => resolve(val), delay));class RandomNumberGenerator {    [Symbol.asyncIterator]() {        return {            next: async () => {                return simulateDelay({ value: Math.random() }, 200); //return the value after 200ms of delay }, }; }}const rand = new RandomNumberGenerator();(async () => {    for await (const random of rand) {        console.log(random); if (random < 0.1) break; }})();