newbie question: variable and function

hello20109876

05-06-2006, 09:15 AM

see the piece of code:
-----------------------------------
<html>
<head>
<script language="JavaScript">
function makeText(var txt,var pic)
{
var s=txt+", hello, "+pic;
return s;
}
</script>
</head>
<body>
*********
<br>
<script language="JavaScript">
var str=makeText("More Text","down.bmp");
document.write(str);
</script>
<br>
</body>
</html>
-------------------------

my questions:

1)why function above can not return that string?
can java-script return a value?

2)are variables in java-script similar to c++ which contain following concepts:
global, constant,reference,pointer variable etc?

3)are there any differences if codes are in one <script ..></script> pair or in 2 <script ..></script> pairs?

BTW: I am a c++/java program, please compare with c++/java if possible.

boxxer03

05-06-2006, 11:54 AM

It won't return a string because your not asking it to return a string, or at least asking it to write it out. This is your code with some corrections and explanations. Granted this may not be the most efficient way, it'll be easier for you to understand because you wrote it.

<script type="text/javascript">

function makeText(txt,pic)

{
var s=txt+", hello, "+pic;
document.write(s);

}
</script>

Now for your 'calling code' (because your calling the function above up):
<script type="text/javascript">

makeText("More Text","down.bmp");

</script>

And you could just place that last code anywhere on the page that you want that text to be displayed. But there are exceptions to the rules, mroe efficient ways of doing things, etc... But its a learning process and you gotta start somewhere. (Just trying to cover my butt because someone usually says that you could do this better by doing this.......whatever......) I'm just trying to give you an idea of how you can do it. I would put it in C++/Java terms btu I have no idea about either of those, so if you have any questions just ask.

hello20109876

05-06-2006, 01:10 PM

many thanks for your long reply.

acturally, after several funny tests, I have solved the problem myself:
result is:
if i add var before parameters of txt and pic, the function doesn't work.

very strange, i don't understand why java-script is designed in this way - I have to just follow it.

:D
:confused:
:rolleyes: