JavaScript Introduction

Charles Russell

Bennu Bird Media

Java Is Not JavaScript

Java JavaScript

Complex language designed for Software Engineers

Simple Language designed for beginners.

Classical Language Prototype Language

Compiled and delivered as byte code Delivered as Text

Runs on Java Virtual Machine (JVM) designed for each operating system

Interpreted

Generally runs on server Generally is run on client

Applets for client not common anymore There are a few tools for server side JS

Both Java's and JavaScript's syntax are derive from C and that is the end relationship

A Rose By Any Name

● JavaScript has many names● Netscape developed the language

– During a brief patnership Sun Copyrighted the name and licensed it to Netscape.

– Oracle bought Sun and the Netscape rights went to Firefox● Other Names for this language include

– Jscript– LiveScript– ECMA Script ( probably the more correct name)

Who has the controls

● The European Computer Manufacturing Association ECMA Controls the standard● Current standard is ECMA 262 5.1

– ES 5– Fully Supported by Current versions of the major browsers– Not supported by Microsoft until IE9

● For older browsers use ES3

Outside of the Browser

● JavaScript is not limited to the browser● Adobe Acrobat● OpenOffice● Auto Cad● Titanium (Phone App Development for both Android

and IOS)● Server side with Node.js

Summary

● Other than having the same Syntactical Roots JavaScript is in no way realted to Java.

● Because of Historic Anomilies JavaScript has a lot of Names.

● The JavaScript Language is defined in ECMA 262.

● JavaScript is not limited to the web browser.

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