Import a javascript file into a javascript file without interfering the HTML code

Question

I wanted to know how to import a javascript file from a source like pastebin.com/raw or dl.dropboxusercontent.com into a javascript file. I'm talking about a solution similar to the @import ""; in CSS.

I'm not trying to interfere the HTML in anyway (e.g.)

<script src="http://pastebin.com/raw/xxxxxx">

Answer 1

 var firstScript = document.getElementsByTagName('script')[0],
 js = document.createElement('script');
 js.src = 'https://pastebin.com/raw/xxxxx';
 firstScript.parentNode.insertBefore(js, firstScript);