JSFiddle - React, Tailwind, and code Playground

HTML

<div class="col-md-2">
  <div class="basket__item-counter" data-price="19920">
    <span class="basket__item-minus">-</span>
    <span class="basket__item-var">1</span>
    <span class="basket__item-plus">+</span>
  </div>
</div>
<div class="col-md-1">
  <div class="basket__item-price">
    19920 Р.
  </div>
</div>

JavaScript

$('.basket__item-minus').click(function(event) {
        var num = parseInt($(this).siblings('.basket__item-var').text(), 10);
        if (num > 1) {
            num--;
            $(this).siblings('.basket__item-var').text(num);
        }
    });
    $('.basket__item-plus').click(function(event) {
        var num = parseInt($(this).siblings('.basket__item-var').text(), 10);
        var cena = $(this).parent('.basket__item-counter').attr('data-price');
        num++;
        $(this).siblings('.basket__item-var').text(num);
    });