Question

I have a script tag with ‘A’ variable and has been initialised as 16 but when I use alert on IE under onclick event, I received undefine rather than 16.

Is this the problem in IE 6?

e.g.

<script type="text/javascript">
var A =16;
</script>

<a href=""  onclick="javascript:alert(A);">undefine</a>

Answer 1

I’d bet on it being caused by some slight confusion…

Being that putting var in front of a variable puts that variable into the local scope only in Javascript, and a variable delcaration without it (a = 16) is global.

function test() {
    a = 16;
    var b = 16;

}
test();

alert(a); # alerts 16
alert(b); # throws error, b is undefined