|Stable release||9.0 (March 2011)|
|Typing discipline||dynamic, weak, duck|
|Major implementations||Windows Script, JScript .NET|
|Usual filename extensions||.js, .jse, .wsf, .wsc (.htm, .html, .asp)|
JScript is implemented as a Windows Script engine. This means that it can be "plugged in" to any application that supports Windows Script, such as Internet Explorer, Active Server Pages, and Windows Script Host. It also means that any application supporting Windows Script can use multiple languages (JScript, VBScript, Perl, and others).
JScript was first supported in the Internet Explorer 3.0 browser released in August 1996. Its most recent version is JScript 9.0, included in Internet Explorer 9.
JScript 10.0 is a separate dialect, also known as JScript .NET, which adds several new features from the unfinished fourth edition of the ECMAScript standard. It must be compiled for .NET Framework version 2 or version 4, but static type annotations are optional.
This is the version used when hosting JScript inside a Web page displayed by Internet Explorer, in an HTML application, in classic ASP, in Windows Script Host scripts and several other 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 7.0 and is also installed for Internet Explorer 6.0 with Windows XP Service Pack 3, while JScript 5.8 was introduced with Internet Explorer 8.0 and is also installed with Internet Explorer 6.0 on Windows Mobile 6.5.
|3.0||Oct 1997||Internet Explorer 4.0||ECMA-262 1st edition[note 2]||1.3|
|4.0||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 6.0 & Windows CE 5.0||ECMA-262 3rd edition||1.5|
|5.7||Nov 2006||Internet Explorer 7.0||ECMA-262 3rd edition + ECMA-327 (ES-CP)[note 3]||1.5|
|5.8||Mar 2009||Internet Explorer 8.0 & Internet Explorer Mobile 6.0||ECMA-262 3rd edition + ECMA-327 (ES-CP) + JSON (RFC 4627)3||1.5|
|9.0||Mar 2011||Internet Explorer 9.0||ECMA-262 5th edition||1.8.1|
JScript is also available on Windows CE (included in Windows Mobile, optional in Windows Embedded CE). The Windows CE version lacks Active Debugging.
JScript .NET 
JScript .NET is a Microsoft .NET implementation of JScript, it is a CLS language and thus inherits very powerful features, but lacks many features of the original JScript language, making it inappropriate for many scripting scenarios. JScript .NET can be used for ASP.NET pages and for complete .NET applications, but the lack of support for this language in Microsoft Visual Studio place it more as an upgrade path for classic ASP using classic JScript than as a new first-class language.
|Version||Platform||Date||Introduced with||Based on|
|7.0||Desktop CLR 1.0||2002-01-05||Microsoft .NET Framework 1.0||ECMA-262 3rd edition[note 4]|
|7.1||Desktop CLR 1.1||2003-04-01||Microsoft .NET Framework 1.1||ECMA-262 3rd edition[note 4]|
|8.0||Desktop CLR 2.0||2005-11-07||Microsoft .NET Framework 2.0||ECMA-262 3rd edition[note 4]|
|10.0||Desktop CLR 4.0||2010-08-03||Microsoft .NET Framework 4.0||ECMA-262 3rd edition[note 4]|
Note: JScript .NET versions are not related to classic JScript versions. JScript .NET is a separate product. Even though JScript .NET is not supported within the Visual Studio IDE, its versions are in sync with other .NET languages versions (C#, VB.NET, VC++) that follows their corresponding Visual Studio versions.
.NET Framework 3.0 and 3.5 are built on top of 2.0 and do not include the newer JScript.NET release (version 10.0 for .NET Framework 4.0).
(Source: file version of jsc.exe JScript.NET compiler and Microsoft.JScript.dll installed with .NET Framework)
See also 
- Active Scripting
- Chakra (JScript engine)
- ECMAScript, the Ecma International language definition standard that all implementations of this language family must at a minimum follow
- Windows Script File
- Windows Script Host
- Microsoft said JScript 3.0 was "the first scripting language to fully conform to the ECMA-262 standard".
- 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.
- JScript .NET is "being developed in conjunction with ECMAScript Edition 4".
- "JScript (ECMAScript3)". Msdn.microsoft.com. Retrieved 2012-08-17.
- "Types of Script Files". Msdn.microsoft.com. Retrieved 2012-08-17.
- "What Is WSH?". Msdn.microsoft.com. Retrieved 2012-08-17.
- What is JScrpt 10.0?
- "What's New in ASP.NET 4.5 and Visual Web Developer 11 Beta: The Official Microsoft ASP.NET Site".
"What’s New for ASP.NET 4.5 and Web Development in Visual Studio 11 Beta".
- Version Information (Windows Scripting - JScript), Microsoft, retrieved 2010-05-31
- Microsoft JScript Features - Non-ECMA (Windows Scripting - JScript), Microsoft, retrieved 2010-05-31
- Microsoft Embraces ECMA Internet Scripting Standard; Delivers Industry's First ECMA-Compliant Scripting Language, JScript 3.0, In Key Microsoft Products, Microsoft, 1997-06-30
- What Is JScript .NET?, Microsoft
|Wikibooks has a book on the topic of: Computer Programming/Hello world|
- JScript documentation in the MSDN Library
- JScript 5.7 Release Notes
- JScript .NET documentation in the MSDN Library
- JScript blog
- jPaq - A Fully Customizable JScript Library