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

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

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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 en.wikipedia.org/wiki/JScript
    – kangax
    Commented Aug 28, 2009 at 4:37

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