[Resolved] Run javascript code on load detail view

Hi.
I want to run a javascript in detail view. I have succeeded in that too. But the javascript code I added, runs 2 times each time.

For example, I’ve included a javascript file that just throws a warning. The code is below.
Every time I refresh the page, this warning message comes up 2 times in a row.
why could it be?

I edited detailviewdefs.php file as follows.

custom/modules/Contacts/metadata/detailviewdefs.php
......
      'includes' => 
      array (
        0 => 
        array (
          'file' => 'modules/Contacts/Contact.js',
          'file' => 'custom/modules/Contacts/js/mytest.js',
          
        ),
      ),
...........

Contents of my mytest.js file;

 custom/modules/Contacts/js/mytest.js

    $(document).ready(function(){
        window.alert("this is test");
         });