optimization - Can I expect this value to be cached by a JavaScript engine? -

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inside function have lines

     var deal_date = new date(deal.created),           cur_date = new date(),     num_days_passed = math.floor((cur_date - deal_date) / (1000*60*60*24));

and i'm wondering whether, since it's in function, value of computation 1000*60*60*24 cached javascript engine. because otherwise have rid of magic number defining constant

window.seconds_per_day = 1000*60*60*24;

and on time gets laborious create code, when 1000*60*60*24 in fact more descriptive reading code (unless they're idiot).


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