循环:JavaScript中的循环结构有for、while、do...while等,用于重复执行一段代码。 延时:使用setTimeout或Promise结合async/await可以实现延时操作。 实现循环延时的方式 方法一:使用setTimeout 代码语言:txt 复制 for (let i = 0; i < 5; i++) { setTimeout(() => { console.log(i); }, i * 1000...
1000); setTimeout(function timer2(){ log(`delay ${Date.now() - now} ms`); }, 5000); someOperation(); function someOperation() { // sync operation... while (Date.now() - now < 3000) {} } 当
JS是单线程的,但却能执行异步任务,这主要是因为JS中存在事件循环(Event Loop)和任务队列(Task Queue); 事件循环(是js实现异步的一种方法,也是js的执行机制):JS会创建一个类似于while(true)的循环,每执行一次循环体的过程称为Tick,每次Tick的过程就是查看是否有待处理事件,如果有则取出相关事件及回调函数放入执行...
OP要求一个while选项。为此,我们需要将setTimeout包装成一个承诺: var machineFuel = 200; var height = 500; round(); async function round() { do { await delay(2000); playerInput = input(); calculate(); } while (machineFuel > 0 && height > 0); } function delay(delay) { return new ...
了解eventloop的运行机制之后我们来做一道题来巩固: //阻塞方法,用于js阻塞//delayTime单位毫秒functionwait(delayTime){letnowStamp =newDate().getTime()constendTime = nowStamp + delayTimewhile(true){if(nowStamp < endTime) {return} nowStamp =newDate().getTime() ...
() => { const delay = Date.now() - timeoutScheduled; console.log(${delay}ms have passed since I was scheduled);}, 100);// 执行一些异步操作将耗时 95mssomeAsyncOperation(() => { const startCallback = Date.now(); // 执行一些可能耗时10ms的操作 while (Date.now() - start...
()-timeoutScheduled;console.log(`${delay}ms have passed since I was scheduled`);},100);// do someAsyncOperation which takes 95 ms to completesomeAsyncOperation(()=>{conststartCallback=Date.now();// do something that will take 10ms...while(Date.now()-startCallback<10){// do ...
}consttimeoutScheduled =Date.now();setTimeout(function() {constdelay =Date.now() - timeoutScheduled;console.log(delay +'ms have passed since I was scheduled'); },100);// 95ms后异步操作才完成someAsyncOperation(function() {conststartCallback =Date.now();// 这里花费了10mswhile(Date.now...
Audio.startTime has been removed. Please use Audio.play( delay ) instead. When loading a DataTexture via DataTextureLoader, it's default minFilter value is now LinearFilter. AssimpJSONLoader has been removed. Please use AssimpLoader instead. SoftwareRenderer has been removed.r108...
Event Loop 基本解释 当Node.js开始运行时,它就会初始化Event Loop,然后处理脚本文件(或者在REPL(read-eval-print-loop)环境中执行,本文不做深入探讨)中的异步API调用,定时器,或process.nextTick方法调用,然后就会开始处理事件循环(Event Loop)。 下图展示了事件循环的各个阶段(每一个盒子被称为事件循环中一个“阶...