setinterval

主要运用到setInterval()方法： 　　<img id='img' src='img/轮播01.png'> 　　<script> 　　　　let img = document.querySlector('img'); 　　　　//初始化计时器 　　　　let timer = null; 　　　　let n = 0; 　　　　timer = setInterval(()=>{ 　　　　　　n++ 　　　　　　if(n>轮播图片数量){ 　　　　　　　　n = 1; 　　　　　　}else{ 　　　　　　　　img.src = "img/轮播0" + n + ".png"; 　　　　},1000) 　　 　　 来源： https://www.cnblogs.com/blogXie/p/11834140.html

概述与区别 setTimeout 和 setInterval 都是时间相关的操作。 区别： setTimeout，延时，操作1次； setInterval ：每隔指定的时间就执行一次表达式 简单实例初探 setTimeout 实例： 延缓1秒后提示 （仅执行1次） function my_alert(){ alert("延缓1秒后执行提示") } setTimeout('my_alert()',1000); //延缓1秒后执行提示 //模态窗遮罩背景 function get_modalbg_height(){ var this_screen_width= $(window).width(); var this_mainImg_height= $(".main-img > img").height(); var modal_bg = $(".modal-bg"); modal_bg.css({ width:this_screen_width, height:this_mainImg_height }); } setTimeout('get_modalbg_height()',100); //延缓1秒后执行提示 setInterval 实例： 间隔3秒，持续弹出 （重复执行） function my_alert2(){ alert("Hi！"); } setInterval

I have a timer that counts down every second. It works great until the user opens up 3 or 4 tabs of the my site, at which point the newest tab's timer goes double or triple speed. I can currently only reproduce the bug in IE8. I was previously using setInterval, and could reproduce the bug in Firefox as well. I'm actually using FBJS (Facebook's Javascript), so I'll just give some pseudocode. function countDown() { ... setTimeout(function() { countDown() }, 1000); } countDown(); However, what I'm really looking for is more theoretical. I know browsers can try and play "catch up" with

I have a container with a lot of small images. <div id="container"> <img src="1.jpg" /> <img src="2.jpg" /> <img src="3.jpg" /> ... <img src="100.jpg" /> </div> I set opacity to 0. (not hidding) Then I want to show(fadeIn) random image after half second. for example 5th, 1st, 55th ... Any suggestions, thanx a lot try this <script type="text/javascript"> //generate random number var randomnumber=Math.floor(Math.random()*$("#container").children().length); $(function() { //hide all the images (if not already done) $("#container > img").hide(); //set timeout for image to appear (set at 500ms)

I'm looking to setup a web page that samples data via AJAX calls from an embedded web-server. How would I set up the code so that one request doesn't overlap another? I should mention I have very little JavaScript experience and also a compelling reason not to use external libraries of any size bigger than maybe 10 or so kilobytes. You may want to consider the option of relaunching your AJAX request ONLY after a successful response from the previous AJAX call. function autoUpdate() { var ajaxConnection = new Ext.data.Connection(); ajaxConnection.request( { method: 'GET', url: '/web-service/',

在制作网页动态效果时，一定会遇到某些需求，要求某段程序等待多时时间后再开始执行，就像在我们的生活中一样，待会儿再开始做一件事。在JavaScript中主要通过定时器实现此类需求，本文将对定时器做一个概括，正对setTimeout()做一个详细用法总结。 一.setInterval与setTimeout的区别 setInterval setInterval()方法可按照指定的周期来调用函数或者计算表达式（以毫秒为单位） 语法： setInterval(函数表达式，毫秒数)； setInterval()会不停的调用函数，直到clearInterval()被调用或者窗口被关闭，由 setInterval()返回的ID值可用作clearInterval()方法的参数。 setTimeout setTimeout()方法用于在指定毫秒数后再调用函数或者计算表达式（以毫秒为单位） 语法： setTimeout(函数表达式，毫秒数)； setTimeout()只执行函数一次，如果需要多次调用可以使用setInterval(),或者在函数体内再次调用setTimeout() 区别 　　通过以上分析可以看出，setTimeout与setInterval的主要区别是: 　　setTimeout()方法只运行一次，也就是说当达到设定的时间后就出发运行指定的代码，运行完后就结束了

How does setInterval handle callback functions that take longer than the desired interval? I've read that the callback may receive the number of milliseconds late as its first argument, but I was unable to find why it would be late (jitter, or long running functions). And the wonderful follow up, does it behave differently for the common browsers? Let me quote an excellent article about timers by John Resig: setTimeout(function(){ /* Some long block of code... */ setTimeout(arguments.callee, 10); }, 10); setInterval(function(){ /* Some long block of code... */ }, 10); These two pieces of code

I can't seem to get angular2 view to be updated on an array.push function, called upon from a setInterval async operation. the code is from this angular plunkr example of setInterval : What i'm trying to do is as follows: import {View, Component, bootstrap, Directive, ChangeDetectionStrategy, ChangeDetectorRef} from 'angular2/angular2' @Component({selector: 'cmp', changeDetection: ChangeDetectionStrategy.OnPush}) @View({template: `Number of ticks: {{numberOfTicks}}`}) class Cmp { numberOfTicks = []; constructor(private ref: ChangeDetectorRef) { setInterval(() => { this.numberOfTicks.push(3);