Update WooCommerce variation text on change

functions.php

<?php


// Add from here


function ele_update_sku() {
?>
<script type="text/javascript">
	jQuery( document ).ready( function($) {
		$( ".single_variation_wrap" ).on( "show_variation", function ( event, variation ) {
			$( '#prod-sku' ).text( variation.sku );
		});
	});
</script>
<?php
}
add_action( 'wp_head', 'ele_update_sku', 10 );