Self executing function and the document.write

Question

Hi, I have this self-executing function:

<script type="text/javascript">
(function() {
var sc      = document.createElement('script'); 
    sc.src   = 'http://blahblah.com/test.js';
    sc.type = 'text/javascript'; 

var s = document.getElementsByTagName('script')[0];
s.parentNode.insertBefore(sc, s);
})();
</script>

All that is contained in test.js is:

document.write('ping!');

However, it hangs -- am I doing something incorrect?

I found a way to go around the document.write but now the only question is why does this not work.

var nc = document.createElement('div');  
nc.appendChild(document.createTextNode('blah'));  
var scr = document.getElementsByTagName('script')[0];  
scr.parentNode.insertBefore(nc, scr);  

Answer 1

I have no idea what you're trying to accomplish, but your code is valid as long as it's hosted on http://blahblah.com/.

Your browser won't let you execute remote code to manipulate the original page. It's not that dumb.