Create a /js
subfolder in your theme directory, if such does not exist already.
Save your script to a file in said folder.
Then, in functions.php:
if ( is_admin() ) {
global $pagenow;
if ( 'customize.php' === $pagenow ) {
add_action( 'admin_enqueue_scripts', 'wpse107236_enqueue_customizer_script' );
}
}
function wpse107236_enqueue_customizer_script() {
wp_enqueue_script(
'your-script-handle',
get_template_directory_uri . '/js/your-script.js',
array( 'jquery' ),
'1.0',
true
);
}
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