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Sometimes I see @cc_on in JavaScript. What does it mean?

Ionuț G. Stan
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Paul D. Waite
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1 Answers1

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It's for conditional compilation. Seems to be a feature of Microsoft's "JScript" ECMAScript implementation.

unwind
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    Not IE but JScript (ECMAScript implementation used in IE). This is important because JScript, for example, is also used in ASP, Windows Script Host, etc. See http://en.wikipedia.org/wiki/JScript – kangax Aug 28 '09 at 04:37