See Also

Description

Allows the use of new JScript language features without sacrificing compatibility with browsers that don't support them.

Remarks

Conditional compilation is activated by using the @cc_on statement, or using an @if or @set statement outside of a comment. Some typical uses for conditional compilation are using new features in JScript, embedding debugging support into a script, and tracing code execution.

It is strongly recommended that conditional compilation code be placed in comments:

//@cc_on
/*@if @_jscript_version == 3
   alert("JScript version 3")
   @else @*/
   alert("You need a more recent script engine.")
//@end

This example uses special comment delimiters that are only used if conditional compilation is activated by the @cc_on statement. Scripting engines that do not understand conditional compilation only see the alert statement informing of the need for a new scripting engine.