Sure you can add the JS CDN link to your WordPress project.
1) first open the function.php page.
2) follow this code.
wp_register_script( 'jQuery', 'http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js', null, null, true ); wp_enqueue_script('jQuery');
If you want to add multiple CDN link, so try it:
wp_register_script( 'jQuery', 'http://netdna.bootstrapcdn.com/bootstrap/3.0.0/js/bootstrap.min.js', null, null, true ); wp_enqueue_script('jQuery'); wp_register_script( 'jQuery', 'http://code.jquery.com/jquery-1.11.1.min.js', null, null, true ); wp_enqueue_script('jQuery');
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