var keywork in javascript problem

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hi every buddy
im new in java script and a want to know that var keyword in javascript use for what?
is using for define variable or scope concept?please give me an example .
thanks

Posted 15-Nov-12 21:36pm

mhd.sbt

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these are some links, you can check it.
benalman.com
bestpractices
developer.mozilla.org/en-US/docs/JavaScript
www.tizag.com

Posted 15-Nov-12 22:00pm

deepak.m.shrma

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OriginalGriff · Accepted Answer · 2012-11-15T21:52:00

It defines a variable, which effectively defines it's scope as the current block.

If you use it, then it always creates a new variable with the given name, if you don't, then it looks back up the current scope(s) until it finds a variable with that name already and uses that instead. Or creates a new variable if it doesn't find one.

I would recommend that you use var whenever you can, as it prevents mistakes later if you didn't mean to use a global variable of the same name in two different functions!