setinterval

Print out a warning every whole second in Matlab

由 我的未来我决定 提交于 2019-12-02 04:40:59
I am trying to print a warning or just a message after every second, like "1 second elapsed". Is there a possibility to realize that? I tried it with tic toc and a loop, but it is pretty insufficient. Furthermore I never get exactly one second. Is there a command that prints every X ms automatically? Any ideas? Thanks in advance. Use a timer object. t = timer; t.ExecutionMode = 'fixedRate'; t.Period = 1; t.TimerFcn = @(~,~)disp('1s elapsed'); start(t) Amro As @Daniel suggested , timer objects are the way to go. One thing to remember is that MATLAB timers execute asynchronously but are not

setInterval and window.onload problem

由 隐身守侯 提交于 2019-12-02 03:02:53
问题 I have this code window.onload = function() { function foo() { alert("test"); } setInterval("foo()",500) } Which returns undefined...When i use it outside the window.onload it works. Can anyone explain me why? 回答1: Using a string command in setInterval() will try to look for the function in the global (window) scope, but since the function is defined in a local scope, it won't be found. You should pass the function itself to setInterval() instead. window.onload = function() { function foo() {

JS中setInterval()和clearInterval()的使用以及注意事项 （实用，赞）

由 北城余情 提交于 2019-12-02 02:06:17
setInterval()： 间隔指定的毫秒数不停地执行指定的代码，定时器 clearInterval()： 用于停止 setInterval() 方法执行的函数代码 使用方法： setInterval(code，millisec)，两个参数都是必须的，第一个参数为要调用的函数或要执行的代码串。第二个参数为周期性执行或调用 code 之间的时间间隔，以毫秒计。 clearInterval(id_of_setinterval)，参数是必须的，为setInterval返回的ID值 示例： <body> <button οnclick="start()">按钮一</button> <button οnclick="stop()">按钮二</button> <script type="text/javascript"> var interval = null;//计时器 var i = 0; function start(){//启动计时器函数 if(interval!=null){//判断计时器是否为空 clearInterval(interval); interval=null; } interval = setInterval(overs,1000);//启动计时器，调用overs函数， } function overs(){ i++; console.log(i); }

JS class method in a setInterval doesn't work [duplicate]

由 烂漫一生 提交于 2019-12-02 01:22:41
This question already has an answer here: Javascript setInterval and `this` solution 9 answers I have this simple example with a class with a setInterval that calls main() every 5 seconds. When it comes to call print() it returns me TypeError: this.print is not a function. And I'm really stuck. Why if I call main() without setInterval it works smoothly but with setInterval it fails? It's weird. Any workaround to call main() periodically without this issue? "use strict"; class test { constructor() { this.interval = setInterval(this.main, 5000); } print(){ console.log('Teeeessssttt'); } main(){

setInterval going too fast

由 你说的曾经没有我的故事 提交于 2019-12-02 01:10:31
I'm new to JS, and decided to start of learning by a making a small game. I am using a setInterval to automate the enemy's attack. For their first attack the interval is correct, but after the second attack it speeds up to attacking almost three times, or more, a second. I'm also having trouble stopping the interval once either the player's or the enemy's health reaches 0. here is pretty much all the code pertaining my problem. The whole code can be found here function deadFunct(){ if(yourHealth <= 0){ window.alert("You dead"); clearInterval(fightAuto); clearInterval(deadAuto); } if

setInterval and window.onload problem

由 妖精的绣舞 提交于 2019-12-02 01:07:08
I have this code window.onload = function() { function foo() { alert("test"); } setInterval("foo()",500) } Which returns undefined...When i use it outside the window.onload it works. Can anyone explain me why? Max Shawabkeh Using a string command in setInterval() will try to look for the function in the global (window) scope, but since the function is defined in a local scope, it won't be found. You should pass the function itself to setInterval() instead. window.onload = function() { function foo() { alert("test"); } setInterval(foo, 500); } Try this: function foo() { alert("test"); } window

How to use setInterval or setTimeout with a for loop?

由 家住魔仙堡 提交于 2019-12-01 22:58:37
I am trying to set an interval when some code runs but only need to do it based on the number of elements there are. Here's a quick example: 5 total elements Run code once every 20 seconds for each element that is found. Can someone please give me a basic example how to do this using plain JavaScript? Everything I have tried just executes all of the code at once instead of doing one element at a time. let's suppose you're talking about elements of an array or a DOM collection (function() { var arr = [...], len = arr.length; (function doProcess() { if (len--) { /* do something with arr[len] */

Memory Leak with an XMLHttpRequest and setInterval

由 纵然是瞬间 提交于 2019-12-01 22:18:24
Here's some code that I run on Google Chrome 19.0.1061.1 (Official Build 125213) dev: <html> <title>Memory Leak</title> <script type="text/javascript"> (function(){ this.window.setInterval(function() { var xhr = new XMLHttpRequest(); xhr.open('GET', '', false); xhr.send(); }, 50); }).call(this); </script> </html> When I inspect memory usage in chrome://tasks, I can see that "Private Memory" is growing up indefinitely (8GB RAM config). If I change the sample of code above to something like that: <html> <title>Memory Leak</title> <script type="text/javascript"> (function(){ var xhr = new

setInterval 和 setTimeout 定时器

由 早过忘川 提交于 2019-12-01 21:44:08
前端定时器 setInterval 和 setTimeout setInterval 循环执行 循环执行就是设置一个时间间隔，每过一段时间都会执行一次这个方法,直到这个定时器被销毁掉。 用法是setInterval（“方法名或方法”，“延时”）， 第一个参数为方法名或者方法，注意为方法名的时候不要加括号，第二个参数为时间间隔（毫秒）。 设置循环执行 this.timer = setInterval(this.updataDevice, 5000) // 第一个参数：this.updataDevice 是ts中的方法，只写方法名不写括号。 // 第二个参数：5000 表示延时，毫秒，5000毫秒=5秒，即执行完本次后，隔5秒再次执行 销毁定时器 案例是vue写的，用vue举例： beforeDestroy() { // 组件销毁前执行 clearInterval(this.timer) // 清除定时器 this.timer = null // 定时器的变量赋值null }, 顺便例一下vue的生命周期函数： beforeCreate: function () { console.group('beforeCreate 创建前状态===============》'); }, created: function () { console.group('created 创建完毕状态===

浅谈前端的BOM和DOM

由 时光总嘲笑我的痴心妄想 提交于 2019-12-01 20:20:22
前端之BOM和DOM 前戏 到目前为止，我们已经学过了JavaScript的一些简单的语法。但是这些简单的语法，并没有和浏览器有任何交互。 也就是我们还不能制作一些我们经常看到的网页的一些交互，我们需要继续学习BOM和DOM相关知识。 JavaScript分为 ECMAScript，DOM，BOM。 BOM（Browser Object Model）是指浏览器对象模型，它使 JavaScript 有能力与浏览器进行“对话”。 DOM （Document Object Model）是指文档对象模型，通过它，可以访问HTML文档的所有元素。 Window对象是客户端JavaScript最高层对象之一，由于window对象是其它大部分对象的共同祖先，在调用window对象的方法和属性时，可以省略window对象的引用。例如：window.document.write()可以简写成：document.write()。 window对象 所有浏览器都支持 window 对象。它表示浏览器窗口。 **如果文档包含框架（frame 或 iframe 标签），浏览器会为 HTML 文档创建一个 window 对象，并为每个框架创建一个额外的 window 对象。* **没有应用于 window 对象的公开标准，不过所有浏览器都支持该对象。* 所有 JavaScript 全局对象
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