JavaScript. 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 Node.js, Apache CouchDB and Adobe Acrobat. JavaScript is a prototype-based, multi-paradigm, single-threaded, dynamic language, supporting object-oriented, imperative, and declarative (e.g. functional programming) styles. JavaScript's dynamic capabilities include runtime object construction, variable parameter lists, function variables, dynamic script creation (via eval), object introspection (via for...in and Object utilities), and source-code recovery (JavaScript functions store their source text and can be retrieved through toString()).
This section is dedicated to the JavaScript language itself, and not the parts that are specific to Web pages or other host environments. Looking to become a front-end web developer? Get started. jQuery 4u, Plugins, Video Tutorials, Coding Tips & jQuery Authors. jQuery UI. jQuery Fundamentals :: A guide to the basics of jQuery.
JavaScript & jQuery:The Missing Manual. jQuery Fundamentals :: JavaScript Basics. jQuery is built on top of JavaScript, a rich and expressive language in its own right. This section covers the basic concepts of JavaScript, as well as some frequent pitfalls for people who have not used JavaScript before. While it will be of particular value to people with no programming experience, even people who have used other programming languages may benefit from learning about some of the peculiarities of JavaScript. Here's a simple JavaScript program that adds a message to the page: In the above example, we use a function called log. This is a helper function that is defined by the JavaScript that powers this site — it is not a built-in JavaScript function. You can use log in the built-in editor for this site, but you'll need to use console.log in your normal code, and then view the output in your browser's console.
You can try running this program by clicking the and it will copy the code to the built-in editor automatically. A comment about comments Variables Functions Objects. Create a new fiddle - JSFiddle. JavaScript Built-in Functions. JavaScript Tutorial.