setinterval

一. setInterval()和setTimeout() 　　1. setTimeout()： 　　　　（1）setTimeout()方法用于在指定的毫秒数后调用，即超时调用 　　　　（2）语法：setTimeout(fn,ms) 　　　　（3）使用clearTimeout()方法阻止函数的执行 　　2. setInterval()： 　　　　（1）setInterval() 方法可按照指定的周期（以毫秒计）来调用函数或计算表达式，即间歇调用 　　　　（2）setInterval() 方法会不停地调用函数，直到 clearInterval() 被调用或窗口被关闭 　　3. 两者的区别与联系： 　　　　参考链接如下： 　　　　　　 https://www.jianshu.com/p/fc9a08ca2c92 　　　　　　 https://www.jianshu.com/p/aa72011e189f?utm_campaign=maleskine&utm_content=note&utm_medium=seo_notes&utm_source=recommendation 　　　　　　 http://qingbob.com/difference-between-settimeout-setinterval/ 　　4. 鉴于setInterval()的弊端，推荐使用setTimeout(

When events are queued with setTimeout/setInterval, and the user is viewing a separate tab, Chrome and Firefox enforce a minimum 1000ms lag before the event is executed. This article details the behaviour. This has been discussed on StackOverflow previously, but the questions and answers only applied to animations. Obviously, an animation can just be forced to update to the latest state when a user re-enters the tab. But the solution does not work for sequenced audio. I have Web Audio API playing several audio files in sequence, and setTimeout is used to countdown to when the next audio file

I am using JavaScript with jQuery. I have the following script to alert hi every 30 seconds. $(document).ready( function() { alert("hi"); setInterval(function() { alert("hi"); }, 30000); }); I want to alert hi when the page loads (when document / page gets completely loaded) and on every 30 seconds interval afterwards (like hi (0s) - hi (30s) - hi (60s).. etc). But my solution works on two instances. One on DOM ready and the other in a loop. Is there any way to do the same in a single instance? You can see my fiddle here . You could use setTimeout instead and have the callback reschedule

Just as the title says: setInterval is only firing its callback once. manifest.json: { //... "content_scripts" : [{ "js" : ["code.js"], //... }], //... } code.js (example): setInterval(alert('only shown once'),2000); Why, and how I could fix it? The code works well outside of an extension (even in a bookmarklet). setInterval(function() { alert('only shown once') },2000); You need to pass a function reference like alert and not a return value alert() setInterval isn't working at all. The first argument should be a function , you are passing it the return value of alert() which isn't a function.

setInterval 与页面切换问题 今天遇到的问题是我用好几个setInterval定时器来做模拟系统的动态表示，当打开页面时，程序能够正常运行，效果正常，但是当我切换到其他页面，过段时间再切回到系统的页面时，动画出现了错乱，不是按原来安排的运行。查了资料后，发现这是因为浏览器本着节省内存的性质，当切换到其他页面时，采油系统页面的定时器不运动，但是动画依然排列，当切换回来的时候，动画加速运动，出现错误，在轮播图之类的页面经常会发生这样的情况。 解决方案 我查了一部分资料，网上一般都是说如何在关闭页面的时候调用函数，比如用onbeforeunload和Onunload，但是我主要是在切换的时候出的问题，查了一上午，终于找到了监听页面切换的函数：如下所示： var hiddenProperty = 'hidden' in document ? 'hidden' : 'webkitHidden' in document ? 'webkitHidden' : 'mozHidden' in document ? 'mozHidden' : null ; var visibilityChangeEvent = hiddenProperty.replace( /hidden/i , 'visibilitychange' ); var onVisibilityChange = function

I use the setInterval function in a website, and it works fine in IE, Chrome, Firefox and Safari. When i try it on ipad/iphone (safari mobile) i get problem: if i scroll the screen, the setInterval function pauses and it resumes only when i stop scrolling! is there a way to prevent the function from pausing? Thanks raina77ow I'm afraid no, there's no way to prevent such behaviour. There's a plenty of topics here in SO about this problem (more-o-less related), here's a particularly interesting one . Its summary is simple: iOS elastic scroll can't be tracked. There's no event listener for it +