JScript

JScript is Microsoft's Active Scripting implementation of ECMAScript. JScript was first supported in Internet Explorer browser 3.0 released in August 1996. When web developers talk about using JavaScript in Internet Explorer, they are actually using JScript. As with any other Active Scripting engine, it is available through Internet Explorer, Windows Script Host, and Active Server Pages. The typical file extension of JScript source code files is .js.

The most recent version of JScript is JScript .NET, which is based on the yet-unfinished version 4 of the ECMAScript standard, and can be compiled for the Microsoft .NET platform. JScript adds several new features to ECMAScript, such as optional static type annotations.

Among internal implementation differences, unlike JavaScript (the original implementation which engine consists of SpiderMonkey), JScript appears to use a reference counting Garbage collection implementation, allowing server-provided client-side scripts to easily cause memory leaks unless properly designed to avoid cyclic references.

Versions

Version	Date	Introduced with	Approx. JavaScript
1.0	Aug 1996	IE 3.0	1.0
2.0	Jan 1997	IIS 3.0	1.1
3.0	Oct 1997	IE 4.0	1.3
4.0		VS 6.0
5.0	Mar 1999	IE 5.0	1.5
5.1		IE 5.01	1.5
5.5	Jul 2000	IE 5.5	1.5
5.6	Oct 2001	IE 6.0	1.5
.NET	2000-7-11	Microsoft .NET Framework 1.0	2.0
8.0	?	?	2.0

(Source: MSDN, WebmasterWorld Forum)

External links

Microsoft JScript resources in the MSDN Library

Gourt Home::Gourt :: JScript

Versions

See also

External links