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Conditional Compilation Variables (JavaScript)

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.

Caution note Caution

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 Store apps, conditional compilation is not supported.

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 JavaScript scripting engine.

@_jscript_version

Contains the JavaScript version number in major.minor format.

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