Prevent client-side caching of javascript within a static file

Question

I have a web app that makes assorted calls to load in javascript. ie:

 <script src="test.js"></script>

I know the common solution to prevent caching is this:

 <script src="test.js<?=$random_number?>"></script>

My challenge is that my app is not served up by a language like PHP/ASP. It is basically just a flat file. (Because we use the same source code as a PhoneGap app)

Is there a cleaner way to do a script tag other than below?

 document.write("<script src='test.js?rnd=" + Math.random() + "'></script>");

Answer 1

use a dom script adder instead of document.write:

function addScript(u,d){(d=document).getElementsByTagName('head')[0].appendChild(d.createElement('script')).src=u}

addScript("test.js?rnd="+Math.random());