Variable Scope

[ieming.chen@gmail.com]

I have a very puzzling question about how JavaScript variable scope
works.

var s = 1;

alert (s); // show s = 1

function show ()
{
alert(s); // show s = undefined, expecting s= 1

var s = 2;
alert(s); // show s = 2
};

Can anybody explain why it is happening this way?

[Joost Diepenmaat]

Re: Variable Scope

timothytoe <timothytoe@gma il.comwrites:

On Feb 12, 12:34 pm, Joost Diepenmaat <jo...@zeekat.n lwrote:

>>>Variable scope in java is function-based.

>
You meant JavaScript, not java.

Oops. Yes, obviously. :-)

ieming, you might want to do what I do--declare all variables at the
top of their functions so that you and JavaScript have the same
understanding of the situation.

That's probably good advice.

--
Joost Diepenmaat | blog: http://joost.zeekat.nl/ | work: http://zeekat.nl/