Conditional Compilation Variables (Windows Scripting - JScript)

 

The following predefined variables are available for conditional compilation. If a variable is not true, it is not defined and behaves as NaN when accessed.

Warning

Conditional compilation is supported in all versions of Internet Explorer prior to Internet Explorer 11. Starting with Internet Explorer 11 Standards mode, and in Windows 8.x Store apps, conditional compilation is not supported.

Variables

Variable	Description
@_win32	True if running on a Win32 system.
@_win16	True if running on a Win16 system.
@_mac	True if running on an Apple Macintosh system.
@_alpha	True if running on a DEC Alpha processor.
@_x86	True if running on an Intel processor.
@_mc680x0	True if running on a Motorola 680x0 processor.
@_PowerPC	True if running on a Motorola PowerPC processor.
@_jscript	Always true.
@_jscript_build	Contains the build number of the JScript scripting engine.
@_jscript_version	Contains the JScript version number in major.minor format.