What's JavaScript? and free JavaScript E-book Dowmload

Introduction

What's JavaScript? What's the difference between JavaScript and Java? Isn't JavaScript just a simplified version of Java? These are common questions that I get all the time.
Netscape originally invented a simple scripting language called LiveScript, which was to be a proprietary add-on to HTML. When Sun's new language Java became unexpectedly popular, Netscape was quick to jump on the Java bandwagon, and re-christened their scripting language JavaScript. Outside of the first four letters, there are almost no other similarities between the two.
Microsoft then added their own version of JavaScript to Internet Explorer, which they named JScript. Unfortunately, the two were not identical, so Netscape then attempted to straighten matters out by turning JavaScript over to ECMA, a Switzerland-based standards body. This gave three main versions of JavaScript-based languages: JavaScript, which works primarily with Netscape's browsers, JScript, which works with Internet Explorer, and ECMAScript, with which no browser is completely compatible. Netscape and Microsoft have both stated that future versions will match the ECMAScript standard, which should lead to convergence. However, as the most-used features are common to all, compatibility is not an issue unless you are trying to use JavaScript to control DHTML.
JavaScript is growing in popularity due to its simple learning curve relative to the amount of power it provides. Complete non-programmers are able to add a little bit of interactivity to their web pages without buying an IDE or sweating over why a program won't compile. There are numerous Web sites which contain any number of scripts available for the taking, and Netscape has fairly complete documentation on their site. And of course, there's the always useful ability to view the source of Web pages.


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