How to modify the paths of js from twentytwelve theme?

Question

<?php wp_head(); ?> from my default wp theme generates

<script type='text/javascript' src='http://example.com/wp-includes/js/comment-reply.min.js?ver=3.5.1'></script>
<script type='text/javascript' src='http://example.com/wp-includes/js/jquery/jquery.js?ver=1.8.3'></script>

The question is... What is generating those two lines and how can i edit that code?

Answer 1

To disable comment-reply go to Discussion Settings and disable Threaded (nested) comments.

Google-hosted jQuery:

function my_scripts() {
    wp_dequeue_script('jquery');

    wp_enqueue_script(
        'jquery', // name
        '//ajax.googleapis.com/ajax/libs/jquery/1.9.0/jquery.min.js', // google hosted, protocol-independent
        array(), // dependencies (empty)
        NULL, // removes version
        true // load in footer, 'false' for header
    );

}    
add_action('wp_enqueue_scripts', 'my_scripts');

Answer 2

Those lines are inserted by functions hooked to wp_enqueue_scripts as in this example from the Codex:

function my_scripts_method() {
    wp_enqueue_script('scriptaculous');            
}    
add_action('wp_enqueue_scripts', 'my_scripts_method');

The scripts themselves were registered and/or enqueued with wp_register_script or wp_enqueue_script.

You can deregister or dequeue script with wp_deregister_script or wp_dequeueu_script

In your case:

wp_dequeue_script('jquery');
wp-dequeue_script('comment-reply');

But this is a good way to break things. I would not deregister or dequeue core scripts unless I were personally managing a site and would continue to do so for the foreseeable future.

Use Google Libraries should load scripts form Google's servers in little bit safer way that just loading your own local copies.