Editing JScript (section)

=== JScript (COM Classic) ===
The original JScript is an [[Active Scripting]] engine. Like other Active Scripting languages, it is built on the [[OLE Automation|COM/OLE Automation]] platform and provides scripting capabilities to host applications.

This is the version used when hosting JScript inside a Web page displayed by [[Internet Explorer]], in an [[HTA (programming language)|HTML application]] before [[Internet Explorer 9|IE9]], as well as in [[Active Server Pages|classic ASP]], [[Windows Script Host]] scripts and other [[OLE Automation|Automation]] environments.

JScript is sometimes referred to as "classic JScript" or "Active Scripting JScript" to differentiate it from newer .NET-based versions.

Some versions of JScript are available for multiple versions of Internet Explorer and Windows. For example, JScript 5.7 was introduced with [[Internet Explorer 7|Internet Explorer 7.0]] and is also installed for [[Internet Explorer 6|Internet Explorer 6.0]] with [[Windows XP]] [[XP service pack 3|Service Pack 3]], while JScript 5.8 was introduced with [[Internet Explorer 8|Internet Explorer 8.0]] and is also installed with Internet Explorer 6.0 on [[Windows Mobile#Windows Mobile 6.5|Windows Mobile 6.5]].

Microsoft's implementation of ECMAScript 5th Edition in [[Windows 8#Consumer Preview|Windows 8 Consumer Preview]] is called ''JavaScript'' and the corresponding [[Visual Studio]] 11 Express Beta includes a "completely new", full-featured JavaScript editor with [[IntelliSense]] enhancements for [[HTML5]] and [[ECMAScript 5]] syntax, "VSDOC" annotations for multiple overloads, simplified [[Document Object Model|DOM]] configuration, brace matching, collapsible outlining and "go to definition".<ref name="vs11beta">{{cite web |url=http://www.asp.net/vnext/overview/whitepapers/whats-new#_Toc318097407 |title=What's New in ASP.NET 4.5 and Visual Web Developer 11 Beta: The Official Microsoft ASP.NET Site |date=13 May 2022 }}<br>{{cite web |url=https://msdn.microsoft.com/en-us/library/hh420390(v=vs.110).aspx#javascript_editor |title=What's New for ASP.NET 4.5 and Web Development in Visual Studio 11 Beta |date=12 May 2015 }}</ref>

{| class="wikitable" style="text-align: center;"
|-
! Version
! Date
! Introduced with<ref>{{citation |url=https://msdn.microsoft.com/en-us/library/s4esdbwz.aspx |title=Version Information (Windows Scripting – JScript) |publisher=Microsoft |access-date=2010-05-31}}</ref>
! Based on{{refn|JScript supports various features not specified in the ECMA standard,<ref>{{citation |url=https://msdn.microsoft.com/en-us/library/4tc5a343.aspx |title=Microsoft JScript Features – Non-ECMA (Windows Scripting – JScript) |publisher=Microsoft |access-date=2010-05-31}}</ref> as does JavaScript.|group=note}}
! Similar [[JavaScript]] version
|-
| 1.0
| Aug 1996
| [[Internet Explorer 3|Internet Explorer 3.0]]
| [[SpiderMonkey|Netscape JavaScript]]
| 1.0
|-
| 2.0
| Jan 1997
| [[Internet Information Services|Windows IIS]] 3.0
| Netscape JavaScript
| 1.1
|-
| 3.0
| Oct 1997
| [[Internet Explorer 4.0]]
| ECMA-262 1st edition{{refn|Microsoft said JScript 3.0 was "the first scripting language to fully conform to the ECMA-262 standard".<ref>{{citation |url=http://www.microsoft.com/presspass/press/1997/Jun97/jecmapr.mspx |title=Microsoft Embraces ECMA Internet Scripting Standard; Delivers Industry's First ECMA-Compliant Scripting Language, JScript 3.0, In Key Microsoft Products |publisher=Microsoft |date=1997-06-30|archive-url=https://web.archive.org/web/20090112221530/http://www.microsoft.com/presspass/press/1997/Jun97/jecmapr.mspx|archive-date=2009-01-12}}</ref>|group=note}}
| 1.3
|-
| 4.0
| 
| [[Microsoft Visual Studio|Visual Studio]] 6.0 (as part of [[Visual InterDev]])
| ECMA-262 1st edition
| 1.3
|-
| 5.0
| Mar 1999
| [[Internet Explorer 5.0]]
| ECMA-262 2nd edition
| 1.4
|-
| 5.1
|
| Internet Explorer 5.01
| ECMA-262 2nd edition
| 1.4
|-
| 5.5
| Jul 2000
| Internet Explorer 5.5 & [[Windows CE]] 4.2
| ECMA-262 3rd edition
| 1.5
|-
| 5.6
| Oct 2001
| [[Internet Explorer 6|Internet Explorer 6.0]] & [[Windows CE]] 5.0
| ECMA-262 3rd edition
| 1.5
|-
| 5.7
| Nov 2006
| [[Internet Explorer 7|Internet Explorer 7.0]]
| ECMA-262 3rd edition<ref>{{cite web |last1=Lakshman |first1=Pratap |title=JScript Deviations from ES3 |url=http://regmedia.co.uk/2007/10/31/jscriptdeviationsfromes3.pdf |website=The Register |publisher=Situation Publishing / Microsoft |access-date=9 February 2020}}</ref> + ECMA-327 (ES-CP){{refn|JScript 5.7 includes an implementation of the ECMAScript Compact Profile (ECMA-327) which turns off features not required by the ES-CP when using the "JScript.Compact" ProgID.{{Citation needed|date=May 2010}}|group=note|name=ES-CP}}
| 1.5
|-
| 5.8
| Mar 2009
| [[Internet Explorer 8|Internet Explorer 8.0]] & [[Internet Explorer Mobile|Internet Explorer Mobile 6.0]]
| ECMA-262 3rd edition + ECMA-327 (ES-CP){{refn|group=note|name=ES-CP}} + [[JSON]] (RFC 4627)
| 1.5
|-
| 11.0
| Jun 2024
| [[Windows 11, version 22H2|Windows 11 version 24H2]]
| (JScript 9 Legacy, designed as a compatible drop-in replacement for JScript 5.8, but not 100% compatible<ref>{{cite web | url=https://learn.microsoft.com/en-us/answers/questions/1071647/windows-11-22h2-has-a-different-way-of-using-the-j | title=Windows 11 22H2 has a different way of using the JS engine? - Microsoft Q&A }}</ref>)
| 1.5
|}

JScript is also available on Windows CE (included in Windows Mobile, optional in Windows Embedded CE). The Windows CE version lacks Active Debugging.