Welcome to the JScript Language
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Welcome to the JScript Language |
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Conditional compilation allows the use of new JScript language features without sacrificing
compatibility with older versions that do not support the features.
Conditional compilation is activated by using the @cc_on statement, or using an @if or @set statement. Some typical uses for conditional compilation include using new features in JScript, embedding debugging support into a script, and tracing code execution. Always place conditional compilation code in comments, so that hosts (like Netscape Navigator) that do not understand conditional compilation will ignore it. Here is an example. /*@cc_on @*/ /*@if (@_jscript_version >= 4) ... alert("JScript version 4 or better"); ... @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 support conditional compilation only see the message informing of the need for a new scripting engine. | ||
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