<input id="id-for-test" class="add_to_cart_list" value="Add to Cart" name="Add to Cart" type="button"
                                                    onclick='sendToDataLayer("Category Lower", "Add to cart");return cat_add_one_to_cart( "<?= $p["id"] ?>", "<?= $param_sku ?>", "<?= $output_price ?>", "<?= $path ?>", "<?= $can_buy_limit ?>" ,"<?=$this_page_type?>")'/>

$('#id-for-test').removeClass('add_to_cart_list').addClass('color-test');