What's the simplest <script> tag with params

Question

I want to include a script tag, while providing a parameter to it. This is what I came up with so far

1. Provide a parameter to script URL (cons: generate multiple JS files)

   <script src="http://example.com/something.js?P=123" type="text/javascript"></script>
   

2. Hide parameter in script tag (cons: same as #1)

   <script src="http://example.com/scripts/123/something.js" type="text/javascript"></script>
   

3. Google Analytics way (cons: ugly, complicated, global variables)

   <script type="text/javascript" charset="utf-8">
     var _something = _something || 123;
     (function() {
       var s = document.createElement('script');
       s.type = 'text/javascript';
       s.src = 'http://example.com/something.js';
       var ss = document.getElementsByTagName('script')[0];
       ss.parentNode.insertBefore(s, ss);
     })();
   </script>
   

Answer 1

If the way the script is executed, depends on how it's called, you can add params like your option 1.

Other ways are:

<script params='{"abc": 123}' src="script.js"></script><!-- params is a non standard, non official attr that the script will read -->

or

<script>var _abc = 123;</script>
<script src="script.js"></script>

or even

<script src="script.js#abc=123"></script>

I have to agree with @outis though: load the same thing for everybody, always, and execute it like you/the client want(s) afterwards.