Rubah option front dan back dengan variant

<script>
jQuery(document).ready(function(){
setTimeout(function() {
  jQuery('select.single-option-selector').on('change', function() {
  var selectLabel = jQuery(this).prev().text().trim();
    if(selectLabel === "Color"){
     var selectedopt =  parseInt( jQuery(this).prop("selectedIndex") );
     jQuery("#cst-container #side-switcher .product-switch:nth-child(" + (selectedopt + 1) + ") img").trigger("click");
    }
  });
}, 1000);
});
  /*$("#productSelect-option-0").change(function () {
var val = parseInt($("#productSelect-option-0").val());
console.log(val);
});*/
  </script>