defer script js - wordpress

functions.php

<?php

function defer_scripts( $tag, $handle, $src ) {
	$defer = array( 
		'my-js'
	);
	if ( in_array( $handle, $defer ) ) {
		return '<script defer src="' . $src . '" type="text/javascript"></script>';
	}

	return $tag;
} 
add_filter( 'script_loader_tag', 'defer_scripts', 10, 3 );