setinterval

I'm writing an application that utilizes JavaScript timeouts and intervals to update the page. Is there a way to see how many intervals are setup? I want to make sure that I'm not accidentally going to kill the browser by having hundreds of intervals setup. Is this even an issue? Paul Dixon I don't think there is a way to enumerate active timers, but you could override window.setTimeout and window.clearTimeout and replace them with your own implementations which do some tracking and then call the originals. window.originalSetTimeout = window.setTimeout; window.originalClearTimeout = window

为了说明问题，代码很短 <script> var test = function(){ console.log('a') } timer1 = setInterval(test(), 1000) timer2 = setInterval(console.log('b'), 1000) </script> 上面的两个定时器中都只执行了一次，并没有重复执行。 解决方案一： 函数名不要叫括号 var test = function(){ console.log('a') } timer1 = setInterval(test, 1000) 解决方案二： 在执行的函数用引号括起来（里面使用单引号，则外面用双引号） var test = function(){ console.log('a') } timer1 = setInterval("test()", 1000) timer2 = setInterval("console.log('b')", 1000) 使用场景，当重复执行的函数需要传入参数，传入的参数有肯能随时变动，只能用方案二的方法来解决。 var test = function(num){ console.log(num) } num = 10 timer1 = setInterval("test(num)", 1000) timer2 = setInterval

While testing a setup with a timed interval, I came across this problem. First of all, I am using sinon's fakeTimers to create the right timed environment. rewire is used as dependency injection library. The problem is, that sometimes applying the fake timer seems to fail when rewire is involved while in some other instances it's perfectly working. Please check out this setup: test.js 'use strict'; require('should'); var sinon = require('sinon'); var rewire = require('rewire'); // this sample will not fall under the fake timer var SampleGlobal = rewire('./testmodule'); describe('Sinon fake

线程和进程 进程和线程的概念可以这样理解： 进程是一个工厂，工厂有它的独立资源--工厂之间相互独立--线程是工厂中的工人，多个工人协作完成任务--工厂内有一个或多个工人--工人之间共享空间 工厂有多个工人，就相当于一个进程可以有多个线程，而且线程共享进程的空间。 进程是 cpu 资源分配的最小单位（是能拥有资源和独立运行的最小单位，系统会给它分配内存） 线程是 cpu 调试的最小单位（线程是建立在进程的基础上的一次程序运行单位，一个进程中可以有多个线程。核心还是属于一个进程。） 浏览器是多进程的 浏览器是多进程的，每打开一个 tab 页，就相当于创建了一个独立的浏览器进程。 浏览器包含的进程： Browser 进程：浏览器的主进程（负责协调，主控），只有一个，作用有： 负责浏览器的界面显示，与用户交互，如前进，后退等 负责各个页面的管理，创建和销毁其它进程 将 Rendered 进程得到的内存中的 Bitmap ,绘制到用户界面上 网络资源的管理，下载 第三方插件进程：每种类型的插件对应一个进程，仅当使用该插件时才创建。 GPU 进程：最多一个，用于 3D 绘制等。 浏览器渲染进程（浏览器内核）（ Render 进程，内部是多线程的）：默认每个 Tab 页面一个进程，互不影响。主要作用为： 页面渲染，脚本执行，事件处理等 在浏览器中打开一个网页相当于新起了一个进程

I'd like to use the setInterval function in jQuery in order to create an alert with the content of one array every 4 seconds. However my alerts show all the values of my array within a short amount of time and it stops for 4 seconds after having displayed all the values. $.each(['html5', 'EDM', 'Coca Cola', 'creativity'], function(id,value) { setInterval(function(){ alert(value); }, 4000); }); In this case, I'd like to display something like : Alert('html5') - 4 seconds - Alert('EDM') - 4 seconds - Alert('Coca Cola') - 4 seconds - Alert('creativity') - 4 seconds - Alert('html5') - 4 seconds -

I've been running into a weird problem repeatedly in JavaScript now. I can't seem to delay setInterval longer. A small example of what happens: var loop; var count; loop = setInterval(start, 30); function start() { //Some code delay(); //Some more code } function delay() { setTimeout(function () { count++; //Animation code if (count <= 1000) delay(); }, 100); } Now what I want to do is, execute 'some code' part, do nothing while the 'animation code' executes, and then execute 'some more code' part. What is happening is that the 'some more code' part and the delay function is getting executed

var firstInterval; var secondInterval; function firstAlert(){ if(firstInterval) clearInterval(firstInterval);//这个是重点 //处理全部 ......... firstInterval = setInterval('firstAlert()', 1000*2); } function secondAlert(){ if(secondInterval) clearInterval(secondInterval);//这个是重点 //处理全部 ....... secondInterval = setInterval('secondAlert()', 1000*3); 来源： https://www.cnblogs.com/lakeliu/p/11948988.html