问如何在不重新加载页面(AJAX)的情况下更新django模板变量？

EN

def cart_proc(request):
    return (dict(cart=Cart(request)))

function addProduct(){
$('form.add-product').on('submit', function(){
    var link = $(this)
    var quantity = $(this).find('#id_quantity').val()
    $.ajax({
        'url': link.attr('action'),
        'type': 'POST',
        'dataType': 'json',
        'data': {
            'quantity': quantity,
            'csrfmiddlewaretoken': $('input[name="csrfmiddlewaretoken"]').val()
        },
        'success': function(data, status, xhr){
            alert('Success');
            return false;
        },
        'error': function(xhr, status, error){
            alert('Error on server. Please try again later.');
            return false;
        }
    });
    return false;
});
}

def add_to_cart(request, id):
    form = QuantityForm(request.POST)
    if form.is_valid():
        product = Product.objects.get(id=id)
        quantity = request.POST['quantity']
        cart = Cart(request)
        cart.add(product, product.price, quantity)
       return JsonResponse({'status': 'success'})