document.write() and alert()

[Agent Moose]

document.write()
The document.write() function allowes you to write anything onto a page.

So, if I want to say Hello World, I would use this:

Code:

<script type="type/javascript">
document.write("Hello World");
</script>

You can also use HTML with it too.
Another thing you can do is call other functions or variables through a document.write() function.  here is an example of a variable being used:

Code:

<script type="type/javascript">
var text = "Hello World";
document.write(text);
</script>

You may also use HTML there.
alert()
The alert() function alowes you to create a pop-up.  So, if you wanted to create a pop-up with the text Hello World, you would do this:

Code:

<script type="type/javascript">
alert("Hello World");
</script>

You may use HTML with it.  Just like the document.write() function, you can use a variable.

Code:

<script type="type/javascript">
var text = "Hello World"
alert(text);
</script>

That would make do the same thing as the alert("Hello World").

[Andrew]

This ones, pretty simple, but really good

So, if I used this, would it only show up once on the forum? Or would it come up everytime someone refreshed?

Code:

<script type="type/javascript">
alert("Welcome to Partners in Crime!");
</script>

[Agent Moose]

Every time someone refreshes.

[Mojobojo82]

That would be annoying I thought there was one When you first go on the Website and when you leave it

[Exilis]

For that you would need to use cookies. Cookies in any language can be confusing, but maybe Moose will make a tutorial about them sometime.