title: How to call common JavaScript function to all the files without adding it in every JS file?
body: <p>I have a log.js file(it contains log function along with some properties) for debugging purpose.
  I have two other js file which are the controlling various behavior of the web application.
  Now I need to  include the log function considering not to repeat the debug function in both the js file and just calling the file name.
  How do I do it?
  The idea is to make my code clean and separate them in other files to limit the size of a single js file.</p>