Return original value jquery / php

I am using this code to run my extra button. It changes original price value to custom value. Is it possible to click again on button named „afterclickbutton“ to get price with original value – meaning get regular price, and reset whole thing, so it could be possible to click again and get custom value, then click and get regular price value etc etc.?

// Přidání bestpprice’ vlastního pole $bestprice = get_post_meta( $product->get_id(), ‘_bestprice’, true);

if( ! empty($bestprice) ):

$bestprice = wc_get_price_to_display( $product, array( 'price' => $bestprice ) );
$reg_price = wc_get_price_to_display( $product, array( 'price' => $product->get_regular_price() ) );
$range = wc_format_sale_price( $reg_price, $bestprice );
?>
<!-- The button and hidden field --> 
<div class="bestprice-wrapper"><br>
    <a href="" class="get_bestprice button alt" id="get_bestprice"><?php _e('Aktivovat lepší cenu');?></a>
    <input type="hidden" name="bestprice" id="bestprice" class="bestprice" value="" />
  </div>
<!-- The jQuery code --> 
<script type="text/javascript">
    (function($){
        var b = '<?php echo $bestprice; ?>',
            i = 'input[name=bestprice]',
            p = 'p.price',
            r = '<?php echo $range; ?>',
            t = 'a#get_bestprice'
            u = true;
        $(t).click( function(e){
            e.preventDefault();
            if(u){
                $(p).html(r);  // Replacing price with the range
                $(i).val(b);  // Set the best price in hidden input field
                $(t).text(‚Activated'); // change button text
                $(t).removeClass('alt'); // Remove button 'alt' class for styling
                                  $(t).removeClass('get_bestprice')
                                          $(t).addClass(‚afterclickbutton')
                                  u = false;   // Disable button


            }
        });
    })(jQuery);
</script>
<?php
endif; }

Answer

Update 2:

if( ! empty($bestprice) ):

$bestprice = wc_get_price_to_display( $product, array( 'price' => $bestprice ) );
$reg_price = wc_get_price_to_display( $product, array( 'price' => $product->get_regular_price() ) );
$range = wc_format_sale_price( $reg_price, $bestprice );
?>
<!-- The button and hidden field --> 
<div class="bestprice-wrapper"><br>
    <a href="" class="get_bestprice button alt" id="get_bestprice"><?php _e('Aktivovat lepší cenu');?></a>
    <input type="hidden" name="bestprice" id="bestprice" class="bestprice" value="" />
  </div>
<!-- The jQuery code --> 
<script type="text/javascript">
(function($){
        var b = '<?php echo $bestprice; ?>',
            o = $('p.price').clone().find('del').remove().end().text().trim().replace(/[^d.,]/g, ''),
            i = 'input[name=bestprice]',
            p = 'p.price',
            r = '<?php echo $range; ?>',
            t = 'a#get_bestprice'
            u = true;
        $(t).click( function(e){
            e.preventDefault();
            if(u){
                if ($(p).attr('type') == undefined){ $(p).attr('type','_regular_price') };
                if ($(`${p}[type="_best_price"]`).length == 0) {
                    $(p).hide().after(`<p class="price" type="_best_price">${r}</p>`); // add best price and hide regulare
                }else{
                    $(`${p}[type="_regular_price"]`).hide();
                    $(`${p}[type="_best_price"]`).show();
                }
                //$(p).html(r);  // Replacing price with the range
                $(i).val(b);  // Set the best price in hidden input field
                $(t).text('Activated') // change button text
                .removeClass('alt get_bestprice') // Remove button 'alt' class for styling
                .addClass('afterclickbutton');
                u = false;   // Disable button
            }else{
                $(`${p}[type="_best_price"]`).hide();
                $(`${p}[type="_regular_price"]`).show();
                $(i).val(o);
                $(t).text('Active best price')
                .addClass('alt get_bestprice')
                .removeClass('afterclickbutton');
                u = true; 
            }
        });
    })(jQuery);
</script>
<?php
endif; }