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Part V: Advanced Technologies > Introduction to JavaScript

Chapter 28. Introduction to JavaScript

JavaScript is a client-side scripting language that adds interactivity to web pages and lets designers control various aspects of the browser itself. With JavaScript, you can do such things as display additional information about links, create mouse rollover effects, change the contents of pages based on certain conditions, randomly display content on a page, load content in new browser windows and frames, and (with some help from CSS) move elements around on the page.

A scripting language is somewhere between a markup language, like HTML, and a full-blown programming language, like Java. With JavaScript, you can add extra functionality to your web site using short snippets of scripting code that has a syntax that's fairly easy to understand.


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