WordPress.org

Tests were measured using a Firefox plugin called Firebug. Firefox was run a Mac Pro (2008) using OS X 10.5.3. Eight files were included in this test: builder.js, controls.js, dragdrop.js, effects.js, prototype.js, scriptaculous.js, slider.js and sound.js - all taken from the script.aculo.us website.

The default behaviour is to specify one file for WP JS to JSMIN and GZIP. <script src="<?php wp_js('/javascript/global.js') ?>" type="text/javascript" charset="utf-8"></script>

However it is also possible to combine several files together. It is very easy and only requires that you comma separate files inside the string parameter. <script src="<?php wp_js('/javascript/sifr-addons.js,/javascript/sifr.js') ?>" type="text/javascript" charset="utf-8"></script>

The admin section

Adding a JavaScript file to a specifc post