JSFiddle - React, Tailwind, and code Playground

HTML

<div class="b-shopcart_table">
    <table>
      <tfoot>
        <tr>
          <td colspan="3"></td>
          <td><span class="b-shopcart_table__total_sum">Итого: <br><span>4</span> товара</span></td>
          <td><span class="b-shopcart_table__total_weight">Общий вес:<br> <span>0</span> грамм</span></td>
          <td></td>
        </tr>
      </tfoot>
      <tbody>
      <tr>
        <th class="b-shopcart_table__cell-1"></th>
        <th class="b-shopcart_table__cell-2">Вставка</th>
        <th class="b-shopcart_table__cell-3">Количество</th>
        <th class="b-shopcart_table__cell-4">Размер</th>
        <th class="b-shopcart_table__cell-5">Вес</th>
        <th class="b-shopcart_table__cell-6"></th>
      </tr>
      <tr class="b-shopcart_table__unit">
        <td class="b-shopcart_table__cell-1">
          <img src="http://fakeimg.pl/75x75/?text=75x75">
          <h3 class="b-shopcart_table__unit__title">Кольцо</h3>
          <dl class="dl-inline">
            <dt><b>Артикул: </b></dt>
            <dd><b>3932</b></dd>
            <dt>Вес изделия, гр:</dt>
            <dd>7.3</dd>
          </dl>
        </td>
        <td class="b-shopcart_table__cell-2">
           <p>Фианит</p>
           <p>Фианит</p>
        </td>
        <td class="b-shopcart_table__cell-3">
          <p><input type="number"/></p>
          <p><input type="number"/></p>
        </td>
        <td class="b-shopcart_table__cell-4">
          <p class="b-shopcart_table__unit__indicator">16</p>
          <p class="b-shopcart_table__unit__indicator">16.5</p>
        </td>
        <td class="b-shopcart_table__cell-5">
          <p class="b-shopcart_table__unit__indicator m-titleColor"><span>5</span> гр</p>
          <p class="b-shopcart_table__unit__indicator m-titleColor"><span>5</span> гр</p>
        </td>
        <td class="b-shopcart_table__cell-6">
          <a href="#" class="b-shopcart_table__unit__delete"></a>
          <a href="#" class="b-shopcart_table__unit__delete"></a>
       ...

JavaScript

//   shopcart
    var NUMBER_UNIT = $('.b-shopcart_table__unit input[type=number]');
    var WEIGHT_UNIT = $('.b-shopcart_table__unit__indicator span');
    /*default status*/
    $(NUMBER_UNIT).val(1);
    $('.b-shopcart_table__total_sum span').html($(NUMBER_UNIT).length);
    /*change*/
    $(NUMBER_UNIT).change(function(){
        /*disable minus numbers*/
        if($(this).val() < 1){
            $(this).val(1);
        }
        var count = 0;
        var weight = 0;
        $(NUMBER_UNIT).each(function(){
            var count_iteration = parseInt($(this).val());
            count += count_iteration;
        });
        var index = 0;
        $(WEIGHT_UNIT).each(function(){
            var count_iteration = parseInt($(this).html());
            count_iteration *= $(NUMBER_UNIT[index]).val();
            weight += count_iteration;
            index++;
        });
         
        $('.b-shopcart_table__total_sum span').html(count);
        $('.b-shopcart_table__total_weight span').html(weight);
    });
//    default weight value
    var weight = 0;
    $(WEIGHT_UNIT).each(function(){
        var index = $(this).parent().index();
        var count_iteration = parseFloat($(this).html());
        weight += count_iteration;
        return weight;
    });
    $('.b-shopcart_table__total_weight span').html(weight);