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JavaScript makes webpages interactive by controlling browser objects like the DOM and reacting to user events.
JavaScript is a cross-platform, object-oriented scripting language used to make webpages interactive, enabling features like animations, clickable controls, and popup menus. It runs inside a host environment (most commonly a web browser) where it can connect to objects such as the Document Object Model (DOM) to control page behavior and respond to user events. Beyond the browser, JavaScript can also be used on the server through technologies such as Node.js, allowing websites to do more than serve static files—for example, handling realtime collaboration and responding to custom requests from code running in the browser. JavaScript includes a standard library (e.g., Array, Map, Math) and core language elements (operators, control structures, statements), and it can be extended with environment-specific objects for client-side (browser/DOM control) and server-side (database communication, persistence, and file manipulation) capabilities.
JavaScript makes webpages interactive by controlling browser objects like the DOM and reacting to user events.
JavaScript can run both client-side (in browsers) and server-side (e.g., Node.js) to add functionality such as realtime collaboration and server request handling.
JavaScript is standardized via ECMAScript, while the DOM is standardized separately (by W3C/WHATWG).
A cross-platform scripting language used to create interactive web experiences by controlling objects in a host environment like the browser.
A standardized representation of an HTML document that exposes document objects to JavaScript so scripts can modify and respond to the page.
A server-side JavaScript runtime that allows JavaScript to perform tasks on the server, such as handling requests and enabling realtime features.
The standardized specification for the JavaScript language behavior, documented in ECMA-262 and approved as an ISO standard.
An object system where inheritance and behavior can vary per object through prototypes, rather than relying on a fixed class hierarchy.
A JavaScript mode that helps prevent common mistakes and “unsafe” behaviors, making code more predictable for developers.
A function expression that runs immediately after it is defined, often used to create scope and avoid interactions between code snippets.
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