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.

Get tips for instantiating JavaScript's prototype-based objects two ways: via constructor functions or object initialization.

JavaScript Date object The Date object in JavaScript is the main element when it comes to handling date and time.

Create a variable in the JavaScript tags to initialize an ActiveX object that can run commands through a command line: Add another line inside the script tags to run a desktop application.