JScript
Encyclopedia : J : JS : JSC : 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 |
See also
- Hello World program in JScript
- JavaScript, the first ECMAScript implementation which also helped to evolve the ECMAScript standard
- ECMAScript, the ECMA language definition standard which all implementations must at a minimum follow
External links
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