
function something()
{

  var x = window.localStorage.getItem('bbb'); // x = hh['bbb']

  x = x * 1 + 1; // x = x + 1

  window.localStorage.setItem('bbb', x); // hh['bbb'] = x

  alert(x);
}


function add_to_cart(id)
{
  var key = 'product_' + id;

  var x = window.localStorage.getItem(key);
  x = x * 1 + 1;
  window.localStorage.setItem(key, x);

  update_orders_input();
  update_orders_button()
}


function cart_get_number_of_items()
{
  var cnt = 0;

  for(var i = 0; i < window.localStorage.length; i++)
  {
    var key = window.localStorage.key(i);
    var value = window.localStorage.getItem(key);

    if (key.indexOf('product_') == 0)
    {
      cnt += value * 1;
    }
  }
  return cnt;
}


function update_orders_input()
{
  var orders = cart_get_orders();
  $('#orders_input').val(orders);
}


function update_orders_button()
{
  var text = 'Cart (' + cart_get_number_of_items() + ')';
  $('#orders_button').val(text);
}


function cart_get_orders()
{
  var orders = '';

  for(var i = 0; i < window.localStorage.length; i++)
  {
    var key = window.localStorage.key(i);
    var value = window.localStorage.getItem(key);

    if (key.indexOf('product_') == 0)
    {
      orders += key + '=' +value + ',';
    }
  }
  return orders;
}


function cancel_order()
{
  alert('aaa');
  return false;
}


function something()
{

  var x = window.localStorage.getItem('bbb'); // x = hh['bbb']

  x = x * 1 + 1; // x = x + 1

  window.localStorage.setItem('bbb', x); // hh['bbb'] = x

  alert(x);
}


function add_to_cart(id)
{
  var key = 'product_' + id;

  var x = window.localStorage.getItem(key);
  x = x * 1 + 1;
  window.localStorage.setItem(key, x);

  update_orders_input();
  update_orders_button()
}


function cart_get_number_of_items()
{
  var cnt = 0;

  for(var i = 0; i < window.localStorage.length; i++)
  {
    var key = window.localStorage.key(i);
    var value = window.localStorage.getItem(key);

    if (key.indexOf('product_') == 0)
    {
      cnt += value * 1;
    }
  }
  return cnt;
}


function update_orders_input()
{
  var orders = cart_get_orders();
  $('#orders_input').val(orders);
}


function update_orders_button()
{
  var text = 'Cart (' + cart_get_number_of_items() + ')';
  $('#orders_button').val(text);
}


function cart_get_orders()
{
  var orders = '';

  for(var i = 0; i < window.localStorage.length; i++)
  {
    var key = window.localStorage.key(i);
    var value = window.localStorage.getItem(key);

    if (key.indexOf('product_') == 0)
    {
      orders += key + '=' +value + ',';
    }
  }
  return orders;
}


function cancel_order()
{
  window.localStorage.clear();

  update_orders_input();
  update_orders_button()
  
  return false;
}

Clear localStorage on cancel