Javascript [Electronic resources] : The Definitive Guide (4th Edition) نسخه متنی

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Javascript [Electronic resources] : The Definitive Guide (4th Edition) - نسخه متنی

David Flanagan

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 •    Table of Contents 

 •    Index 

 •    Reviews 

 •    Examples 

 •    Reader Reviews 

 •    Errata 

   

 JavaScript: The Definitive Guide, 4th Edition 

 By David Flanagan 

      

 Publisher   : O'Reilly 

 Pub Date   : November 2001 

 ISBN   : 0-596-00048-0 

 Pages   : 936 

 Slots   : 1     

This fourth edition of the definitive reference to JavaScript, a scripting language that can be embedded directly in web pages, covers the latest version of the language, JavaScript 1.5, as supported by Netscape 6 and Internet Explorer 6. The book also provides complete coverage of the W3C DOM standard (Level 1 and Level 2), while retaining material on the legacy Level 0 DOM for backward compatibility.

 

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1.2 Versions of JavaScript





JavaScript
has evolved over the years, and Netscape has released several
versions of the language. Microsoft has released similar versions of
the JavaScript language under the name "JScript." And
ECMA (http://www.ecma.ch) has
published three versions of the
ECMA-262 standard that standardize
the JavaScript language under the awkward name
"ECMAScript."

Table 1-1 lists these various
versions and explains their
key features and how they are related to one another. In this book, I
often use the name "JavaScript" to refer to any
implementation of the language, including Microsoft's JScript.
When I'm specifically referring to ECMAScript, I often use the
terms "ECMA-262" or "ECMA."


Table 1-1. Versions of JavaScript



































































Version


Description


JavaScript 1.0


The original version of the language. It was buggy and is now
essentially obsolete. Implemented by Netscape 2.


JavaScript 1.1


Introduced a true Array object; most serious bugs resolved.
Implemented by Netscape 3.


JavaScript 1.2


Introduced the switch statement, regular
expressions, and a number of other features. Almost compliant with
ECMA v1, but has some incompatibilities. Implemented by Netscape 4.


JavaScript 1.3


Fixed incompatibilities of JavaScript 1.2. Compliant with ECMA v1.
Implemented by Netscape 4.5.


JavaScript 1.4


Implemented only in Netscape server products.


JavaScript 1.5


Introduced exception handling. Compliant with ECMA v3. Implemented by
Mozilla and Netscape 6.


JScript 1.0


Roughly equivalent to JavaScript 1.0. Implemented by early releases
of IE 3.


JScript 2.0


Roughly equivalent to JavaScript 1.1. Implemented by later releases
of IE 3.


JScript 3.0


Roughly equivalent to JavaScript 1.3. Compliant with ECMA v1.
Implemented by IE 4.


JScript 4.0


Not implemented by any web browser.


JScript 5.0


Supported exception handling. Partially compliant with ECMA v3.
Implemented by IE 5.


JScript 5.5


Roughly equivalent to JavaScript 1.5. Fully compliant with ECMA v3.
Implemented by IE 5.5 and IE 6. (IE 6 actually implements JScript
5.6, but 5.6 is not different from 5.5 in any way that is relevant to
client-side JavaScript programmers.)


ECMA v1


The first standard version of the language. Standardized the basic
features of JavaScript 1.1 and added a few new features. Did not
standardize the switch statement or regular
expression support. Conformant implementations are JavaScript 1.3 and
JScript 3.0.


ECMA v2


A maintenance release of the standard that included clarifications
but defined no new features.


ECMA v3


Standardized the switch statement, regular
expressions, and exception handling. Conformant implementations are
JavaScript 1.5 and JScript 5.5.



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