Javascript implementation of progress bar function based on timer
This article mainly introducesjavascriptimplementation of progress bar function based on timer. It briefly analyzes the function and usage of javascript timer and gives an example of progress bar function based on timer. Friends who are interested in JavaScript can refer to this article
The example in this article describes how JavaScript implements the progress bar function based on a timer. Share it with everyone for your reference, the details are as follows:
Timer in Javascript
windowThe method below the first linewindow. setInterval() Start the timer
1.setInterval(function(function),time(how often the function is executed, in milliseconds))
will repeatedly execute an item Operation
2.setTimeout is used to delay a period of time before performing an operation
setTimeout(function,time) ,setTimeout will not be repeated!
Stop the timer:
setTimeout corresponds to clearTimeout (object) Clear the set Tiemout object
setInterval corresponds is clearInterval(object) Clear the setInterval object
Gives a case:
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>www.php.cn js进度条</title>
<style type="text/css">
#outer/*外部*/
{
margin-top:100px;
border:solid black 1px;
background-color:white;
width:1004px;
height:54px;
}
#inner/*内部*/
{
background-color:red;
width:0px;/*首先将内部的宽度定为0，用show（）来实现进度条！*/
height:50px;
margin-left:2px;
margin-top:2px;
}
</style>
<script language="javascript">
function show()
{
if(document.getElementById("inner").offsetWidth<1000)//offsetWidth实现的时候width是没有宽度的，而style.width实现的时候则有宽度（px）！
{
document.getElementById("inner").style.width=
document.getElementById("inner").offsetWidth+20+"px";//每次执行show()函数的时候宽度都会加上20！
console.log(document.getElementById("inner").style.width);//console 控制台 ：可以在网页上看到width的变化(利用F12)
}
else
{
document.getElementById("inner").style.width=1000+"px";//如果大于1000px的话，只能将1000px赋值给border-width;!
stop();//此时就应该执行停止定时器的函数！
}
}
var timer;//定义在两个函数外面，因为两个函数都会用到！
function start()
{
timeer = window.setInterval(show,200);//每隔200ms调用一次show函数
}
function stop()
{
timer = window.clearInterval(timer);
}
</script>
</head>
<body onload="start()">
<p id="outer">
<p id="inner">
</p>
</p>
</body>
</html>When running the program, the The progress bar will load, and the loading speed is related to time!
Related recommendations:
Solution to problems related to weird ajaxFileUpload.js uploading files
javascript - Qiniu JS upload prompts that the specified space does not exist
javascript - How to initialize the uploader after clicking a button when uploading Qiniu js
The above is the detailed content of Javascript implementation of progress bar function based on timer. For more information, please follow other related articles on the PHP Chinese website!
JavaScript and the Web: Core Functionality and Use CasesApr 18, 2025 am 12:19 AMThe main uses of JavaScript in web development include client interaction, form verification and asynchronous communication. 1) Dynamic content update and user interaction through DOM operations; 2) Client verification is carried out before the user submits data to improve the user experience; 3) Refreshless communication with the server is achieved through AJAX technology.
Understanding the JavaScript Engine: Implementation DetailsApr 17, 2025 am 12:05 AMUnderstanding how JavaScript engine works internally is important to developers because it helps write more efficient code and understand performance bottlenecks and optimization strategies. 1) The engine's workflow includes three stages: parsing, compiling and execution; 2) During the execution process, the engine will perform dynamic optimization, such as inline cache and hidden classes; 3) Best practices include avoiding global variables, optimizing loops, using const and lets, and avoiding excessive use of closures.
Python vs. JavaScript: The Learning Curve and Ease of UseApr 16, 2025 am 12:12 AMPython is more suitable for beginners, with a smooth learning curve and concise syntax; JavaScript is suitable for front-end development, with a steep learning curve and flexible syntax. 1. Python syntax is intuitive and suitable for data science and back-end development. 2. JavaScript is flexible and widely used in front-end and server-side programming.
Python vs. JavaScript: Community, Libraries, and ResourcesApr 15, 2025 am 12:16 AMPython and JavaScript have their own advantages and disadvantages in terms of community, libraries and resources. 1) The Python community is friendly and suitable for beginners, but the front-end development resources are not as rich as JavaScript. 2) Python is powerful in data science and machine learning libraries, while JavaScript is better in front-end development libraries and frameworks. 3) Both have rich learning resources, but Python is suitable for starting with official documents, while JavaScript is better with MDNWebDocs. The choice should be based on project needs and personal interests.
From C/C to JavaScript: How It All WorksApr 14, 2025 am 12:05 AMThe shift from C/C to JavaScript requires adapting to dynamic typing, garbage collection and asynchronous programming. 1) C/C is a statically typed language that requires manual memory management, while JavaScript is dynamically typed and garbage collection is automatically processed. 2) C/C needs to be compiled into machine code, while JavaScript is an interpreted language. 3) JavaScript introduces concepts such as closures, prototype chains and Promise, which enhances flexibility and asynchronous programming capabilities.
JavaScript Engines: Comparing ImplementationsApr 13, 2025 am 12:05 AMDifferent JavaScript engines have different effects when parsing and executing JavaScript code, because the implementation principles and optimization strategies of each engine differ. 1. Lexical analysis: convert source code into lexical unit. 2. Grammar analysis: Generate an abstract syntax tree. 3. Optimization and compilation: Generate machine code through the JIT compiler. 4. Execute: Run the machine code. V8 engine optimizes through instant compilation and hidden class, SpiderMonkey uses a type inference system, resulting in different performance performance on the same code.
Beyond the Browser: JavaScript in the Real WorldApr 12, 2025 am 12:06 AMJavaScript's applications in the real world include server-side programming, mobile application development and Internet of Things control: 1. Server-side programming is realized through Node.js, suitable for high concurrent request processing. 2. Mobile application development is carried out through ReactNative and supports cross-platform deployment. 3. Used for IoT device control through Johnny-Five library, suitable for hardware interaction.
Building a Multi-Tenant SaaS Application with Next.js (Backend Integration)Apr 11, 2025 am 08:23 AMI built a functional multi-tenant SaaS application (an EdTech app) with your everyday tech tool and you can do the same. First, what’s a multi-tenant SaaS application? Multi-tenant SaaS applications let you serve multiple customers from a sing
Hot AI Tools
Undresser.AI Undress
AI-powered app for creating realistic nude photos
AI Clothes Remover
Online AI tool for removing clothes from photos.
Undress AI Tool
Undress images for free
Clothoff.io
AI clothes remover
AI Hentai Generator
Generate AI Hentai for free.
Hot Article
Hot Tools
MinGW - Minimalist GNU for Windows
This project is in the process of being migrated to osdn.net/projects/mingw, you can continue to follow us there. MinGW: A native Windows port of the GNU Compiler Collection (GCC), freely distributable import libraries and header files for building native Windows applications; includes extensions to the MSVC runtime to support C99 functionality. All MinGW software can run on 64-bit Windows platforms.
Dreamweaver CS6
Visual web development tools
WebStorm Mac version
Useful JavaScript development tools
ZendStudio 13.5.1 Mac
Powerful PHP integrated development environment
Notepad++7.3.1
Easy-to-use and free code editor
