Built-in JavaScript objects and functions are ones you'll use all the time. Here's how to use Object, JSON, String, Math, Date, and console in your JavaScript programs.

There are two kinds of object variables in JavaScript: Variables that contain built-in browser-related objects—window, document, and so on. These are references to objects you did not create.

What is JSON (JavaScript Object Notation)? JSON (JavaScript Object Notation) is a text-based, human-readable data interchange format used to exchange data between web clients and web servers. The ...

Based on open standards, AJAX uses a browser built-in XMLHttpRequest object, JavaScript and HTML Document Object Model (DOM) to exchange data between a web browser and web server, and to display this ...

So if you have JavaScript that swaps an image on mouseover, or changes an image automatically after a timeout, you can expect ...