Global variable does not want to change...

jimmy.dillies

Hello, I have a global variable which does not want to change :
<header>
....
<script type="text/javascript" language="JavaScript">
var i=1;
function swap()
{
var window.i = 1 - window.i ;
}
.....
</script>
....
<body>

<A href="" ... onclick="swap()"<img src="pix/star.gif" </A>

when clicking on 'star.gif', i does not change from 1 to 0 ...

Any clue ?
Thanks,
Jimmy

Nov 8 '06 #1

Subscribe Post Reply

2303

buhailiang

"ji***********@gmail.com Ð´µÀ£º
"

Hello, I have a global variable which does not want to change :
<header>
...
<script type="text/javascript" language="JavaScript">
var i=1;
function swap()
{
var window.i = 1 - window.i ;

~~~you reclaim the value, delete the "var" will be ok

}
....
</script>
...
<body>

<A href="" ... onclick="swap()"<img src="pix/star.gif" </A>

when clicking on 'star.gif', i does not change from 1 to 0 ...

Any clue ?
Thanks,
Jimmy

Nov 8 '06 #2

Lich_Ray

Using global variable is not a good choose. Remenber global function is
always blind to global namespace. The best choose is, use "this.i"
instead of "window.i".

Nov 8 '06 #3

Lee

Lich_Ray said:

>
Using global variable is not a good choose. Remenber global function is
always blind to global namespace. The best choose is, use "this.i"
instead of "window.i".

If I understand you correctly, you're wrong.
functions have full access to global variables.
That's what "global" means:

<html>
<body>
<script type="text/javascript">
var globalVariable="Hello, world!";
function globalFunction() {
alert(globalVariable);
globalVariable="Goodbye";
}
globalFunction();
alert(globalVariable);
</script>
</body>
</html>
--

Nov 8 '06 #4

Michael Winter

ji***********@gmail.com wrote:

[snip]

<script type="text/javascript" language="JavaScript">

The language attribute is deprecated and redundant. Omit it.

var i=1;
function swap()
{
var window.i = 1 - window.i ;

That is a syntax error: variable declarations consist of a comma
separated list of /identifiers/, with optional initialisers. The
character sequence, "window.i" is not an identifier.

function swap() {
i = 1 - i;
}

will do. You don't want a variable declaration within the function body:
that would make i a local variable.

[snip]

Mike

Nov 8 '06 #5

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