9.0 / March 2011
|Typing discipline||Dynamic, weak, duck|
|Filename extensions||.js, .jse, .wsf, .wsc (.htm, .html, .asp)|
|Active Scripting, JScript .NET|
JScript is implemented as an Active Scripting engine. This means that it can be "plugged in" to OLE Automation applications that support Active Scripting, such as Internet Explorer, Active Server Pages, and Windows Script Host. It also means such applications can use multiple Active Scripting languages, e.g., JScript, VBScript or PerlScript.
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 abandoned 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 (64-bit)||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 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 places 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]|
JScript .NET is not supported in the .NET Compact Framework.
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 follow 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)
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