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JavaScript ( / ˈdʒɑːvəskrɪpt / ), often abbreviated as JS, is a programming language and core technology of the Web, alongside HTML and CSS. 99% of websites use JavaScript on the client side for webpage behavior. [ 10] Web browsers have a dedicated JavaScript engine that executes the client code.
Type. JavaScript and WebAssembly engine. License. BSD [ 3] Website. v8 .dev. V8 is takedown a JavaScript and WebAssembly engine developed by Google for its Chrome browser. [ 1][ 4] V8 is free and open-source software that is part of the Chromium project and also used separately in non-browser contexts, notably the Node.js runtime system.
JSON ( JavaScript Object Notation, pronounced / ˈdʒeɪsən / or / ˈdʒeɪˌsɒn /) is an open standard file format and data interchange format that uses human-readable text to store and transmit data objects consisting of attribute–value pairs and arrays (or other serializable values).
jQuery is a JavaScript library designed to simplify HTML DOM tree traversal and manipulation, as well as event handling, CSS animations, and Ajax. [ 3] It is free, open-source software using the permissive MIT License. [ 4] As of August 2022, jQuery is used by 77% of the 10 million most popular websites. [ 5]
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 . The JavaScript standard library lacks an official standard text output function (with the exception of document.write ).
JavaScript library. A JavaScript library is a library of pre-written JavaScript code that allows for easier development of JavaScript-based applications, [ 1] especially for AJAX and other web-centric technologies. [ 2] They can be included in a website by embedding it directly in the HTML via a script tag.
Node.js is a cross-platform, open-source JavaScript runtime environment that can run on Windows, Linux, Unix, macOS, and more. Node.js runs on the V8 JavaScript engine, and executes JavaScript code outside a web browser . Node.js lets developers use JavaScript to write command line tools and for server-side scripting.
JavaScript engines are typically developed by web browservendors, and every major browser has one. In a browser, the JavaScript engine runs in concert with the rendering enginevia the Document Object Modeland Web IDLbindings.[2] However, the use of JavaScript engines is not limited to browsers; for example, the V8 engineis a core component of ...