Información de versión de JScript
Actualización: noviembre 2007
JScript es un lenguaje que continúa evolucionando y cada nueva versión del lenguaje presenta nuevas características. Para sacar partido a todas las características que proporciona una versión determinada del lenguaje, es necesario poseer una versión compatible del compilador o motor de secuencias de comandos.
Versiones y aplicaciones host
Cuando se escribe código para una aplicación de servidor o un programa de línea de comandos, normalmente se conocen la versión del compilador y la versión de JScript que admite. Sin embargo, cuando se escriben secuencias de comandos de cliente que se ejecutan en el motor de secuencias de comandos de un explorador, la secuencia en ejecución detecta la versión del motor. Una vez que se conoce la versión del motor, se puede ejecutar una secuencia de comandos escrita en una versión compatible de JScript. Para obtener más información, vea Detectar las funciones del explorador.
La tabla siguiente muestra la versión de Microsoft JScript implementada por las aplicaciones host.
Aplicación host |
1.0 |
2.0 |
3.0 |
4.0 |
5.0 |
5.1 |
5.5 |
5.6 |
.NET |
8.0 |
---|---|---|---|---|---|---|---|---|---|---|
Microsoft Internet Explorer 3.0 |
x |
|
|
|
|
|
|
|
|
|
Microsoft Internet Information Server 3.0 |
|
x |
|
|
|
|
|
|
|
|
Microsoft Internet Explorer 4.0 |
|
|
x |
|
|
|
|
|
|
|
Microsoft Internet Information Server 4.0 |
|
|
x |
|
|
|
|
|
|
|
Microsoft Internet Explorer 5.0 |
|
|
|
|
x |
|
|
|
|
|
Microsoft Internet Explorer 5.01 |
|
|
|
|
|
x |
|
|
|
|
Microsoft Windows 2000 |
|
|
|
|
|
x |
|
|
|
|
Microsoft Internet Explorer 5.5 |
|
|
|
|
|
|
x |
|
|
|
Microsoft Windows Millennium |
|
|
|
|
|
|
x |
|
|
|
Microsoft Internet Explorer 6.0 |
|
|
|
|
|
|
|
x |
|
|
Microsoft Windows XP |
|
|
|
|
|
|
|
x |
|
|
Microsoft Windows Server 2003 |
|
|
|
|
|
|
|
x |
|
|
Microsoft .NET Framework 1.0 |
|
|
|
|
|
|
|
|
x |
|
Nota: |
---|
El número de versión proporcionado por la función ScriptEngineMajorVersion y la variable de compilación condicional @_jscript_version siempre son valores numéricos. De esta forma, es posible realizar la comparación numérica con el número de versión. Para las aplicaciones de la versión .NET, la versión proporcionada es la 7.x, no la .NET. Esto significa que los motores que proporcionan un número de versión 7.x o superior pueden compilar código de JScript 8.0. |
La tabla siguiente muestra las características del lenguaje JScript y la versión en la que se introdujeron por primera vez.
Elemento del lenguaje |
1.0 |
2.0 |
3.0 |
4.0 |
5.0 |
5.5 |
.NET |
8.0 |
---|---|---|---|---|---|---|---|---|
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Operador de asignación y desplazamiento a la izquierda (<<=) |
x |
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Operador de asignación y desplazamiento a la derecha sin signo (>>>=) |
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