How to prevent caching of my js & json file? (no cache)

 <script src="test.js?version=1"></script>

<script src="test.js?random=<?php echo uniqid(); ?>"></script>

EDIT: Or you could use the file modification time so that it's cached on the client.

<script src="test.js?random=<?php echo filemtime('test.js'); ?>"></script>