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JS Tutorial

JS HOME JS Introduction JS Where To JS Output JS Statements JS Syntax JS Comments JS Variables JS Let JS Const JS Operators JS Arithmetic JS Assignment JS Data Types JS Functions JS Objects JS Events JS Strings JS String Methods JS String Search JS String Templates JS Numbers JS BigInt JS Number Methods JS Number Properties JS Arrays JS Array Methods JS Array Search JS Array Sort JS Array Iteration JS Array Const JS Dates JS Date Formats JS Date Get Methods JS Date Set Methods JS Math JS Random JS Booleans JS Comparisons JS If Else JS Switch JS Loop For JS Loop For In JS Loop For Of JS Loop While JS Break JS Iterables JS Sets JS Maps JS Typeof JS Type Conversion JS Bitwise JS RegExp JS Precedence JS Errors JS Scope JS Hoisting JS Strict Mode JS this Keyword JS Arrow Function JS Classes JS Modules JS JSON JS Debugging JS Style Guide JS Best Practices JS Mistakes JS Performance JS Reserved Words

JS Versions

JS Versions JS 2009 (ES5) JS 2015 (ES6) JS 2016 JS 2017 JS 2018 JS 2019 JS 2020 JS 2021 JS 2022 JS 2023 JS IE / Edge JS History

JS Objects

Object Definitions Object Properties Object Methods Object Display Object Accessors Object Constructors Object Prototypes Object Iterables Object Sets Object Maps Object Reference

JS Functions

Function Definitions Function Parameters Function Invocation Function Call Function Apply Function Bind Function Closures

JS Classes

Class Intro Class Inheritance Class Static

JS Async

JS Callbacks JS Asynchronous JS Promises JS Async/Await

JS HTML DOM

DOM Intro DOM Methods DOM Document DOM Elements DOM HTML DOM Forms DOM CSS DOM Animations DOM Events DOM Event Listener DOM Navigation DOM Nodes DOM Collections DOM Node Lists

JS Browser BOM

JS Window JS Screen JS Location JS History JS Navigator JS Popup Alert JS Timing JS Cookies

JS Web APIs

Web API Intro Web Forms API Web History API Web Storage API Web Worker API Web Fetch API Web Geolocation API

JS AJAX

AJAX Intro AJAX XMLHttp AJAX Request AJAX Response AJAX XML File AJAX PHP AJAX ASP AJAX Database AJAX Applications AJAX Examples

JS JSON

JSON Intro JSON Syntax JSON vs XML JSON Data Types JSON Parse JSON Stringify JSON Objects JSON Arrays JSON Server JSON PHP JSON HTML JSON JSONP

JS vs jQuery

jQuery Selectors jQuery HTML jQuery CSS jQuery DOM

JS Graphics

JS Graphics JS Canvas JS Plotly JS Chart.js JS Google Chart JS D3.js

JS Examples

JS Examples JS HTML DOM JS HTML Input JS HTML Objects JS HTML Events JS Browser JS Editor JS Exercises JS Quiz JS Website JS Bootcamp JS Certificate

JS References

JavaScript Objects HTML DOM Objects


JavaScript Online Editor


JavaScript Editor

With our online JavaScript editor, you can edit HTML, CSS and JavaScript code, and view the result in your browser.


Run » Size:

Example

let x = 5;
let y = 6;
let z = x + y;
11
Try it Yourself »

Click on the "Try it Yourself" button to see how it works.


Publish Your Code

If you want to save your HTML, CSS and JavaScript code, and create your own website, check out W3Schools Spaces.

W3Schools Spaces is a website-building tool that lets you make and share your own website.

You can change the website's look and how it works by editing the code right in your web browser.

It's easy to use and doesn't require any setup:

The code editor is packed with features to help you achieve more:

  • Templates: Start from scratch or use a template
  • Cloud-based: no installations required. You only need your browser
  • Terminal & Log: debug and troubleshoot your code easily
  • File Navigator: switch between files inside the code editor
  • And much more!
Learn More

Learn Faster

Practice is key to mastering coding, and the best way to put your JavaScript knowledge into practice is by getting practical with code.

Use W3Schools Spaces to build, test and deploy code.

The code editor lets you write and practice different types of computer languages. It includes HTML/CSS/JavaScript, and you can use it for other languages too.

New languages are added all the time:

Languages
Learn More

If you do not know JavaScript, we suggest that you read our JavaScript Tutorial from scratch.


Build Powerful Websites

You can also use the code editor in W3School Spaces to build frontend or full-stack websites from scratch.

Or you can use the 60+ templates available and save time:

Photographer website template
Blog website template
Webshop template
Tutor website template

Create your Spaces account today and explore them all!

Learn More

Share It With The World

Host and publish your websites in no time with W3School Spaces.

W3Schools subdomain and SSL certificate are included for free with W3School Spaces. An SSL certificate makes your website safe and secure. It also helps people trust your website and makes it easier to find it online.

Want a custom domain for your website?

You can buy a domain or transfer an existing one and connect it to your space.

Learn More

How Does It Work?

Get started in a few clicks with W3School Spaces.