JavaScript (/ ˈ dʒ ɑː v ə s k r ɪ p t / ⓘ), often abbreviated as JS, is a programming language and core technology of the World Wide Web, alongside HTML and CSS. Ninety-nine percent of websites use JavaScript on the client side for webpage behavior. [10] Web browsers have a dedicated JavaScript engine that executes the client code.

JavaScript is a high-level programming language that follows the ECMAScript standard. It was originally designed as a scripting language for websites but became widely adopted as a general-purpose programming language , and is currently the most popular programming language in use. [ …

Apr 3, 2025 · JavaScript (JS) is a lightweight interpreted (or just-in-time compiled) programming language with first-class functions. While it is most well-known as the scripting language for Web pages, many non-browser environments also use it, such as …

5 days ago · JavaScript is a lightweight interpreted programming language. The web browser receives the JavaScript code in its original text form and runs the script from that.

ECMAScript (/ ˈ ɛ k m ə s k r ɪ p t /; ES) [1] is a standard for scripting languages, including JavaScript, JScript, and ActionScript. It is best known as a JavaScript standard intended to ensure the interoperability of web pages across different web browsers. [2] It is standardized by Ecma International in the document ECMA-262.

Mar 7, 2025 · The JavaScript reference serves as a repository of facts about the JavaScript language. The entire language is described here in detail. As you write JavaScript code, you'll refer to these pages often (thus the title "JavaScript reference").

This wiki aims to host a large centralized JavaScript library of useful functions, tips, etc., in a way which could enhance or draw attention to the existing materials elsewhere on the web--but with open source materials and not limited to a particular implementation (e.g., Mozilla).

The syntax of JavaScript is the set of rules that define a correctly structured JavaScript program. The examples below make use of the log function of the console object present in most browsers for standard text output .

Mar 31, 2025 · This book is a guide to JavaScript, a scripting language widely used in web pages and web applications such as email applications. JavaScript is not to be confused with Java, which is quite a separate language for creating stand-alone applications. This book applies to version 1.6 and later of JavaScript.

Aug 8, 2022 · Today, JavaScript has a unique position as the most widely-adopted browser language, fully integrated with HTML/CSS. There are many languages that get “transpiled” to JavaScript and provide certain features. It is recommended to take a look at them, at least briefly, after mastering JavaScript.