function CartUpdate(action, cartitemid, quantity) {
    var url;

    switch (action) {
        case "delete":
            if (!confirm("您确认删除么"))
                return false;
            var url = '/shop/CartUpdate.aspx?Action=Delete&CartItemID=' + cartitemid;
            break;
        case "update":

            var url = '/shop/CartUpdate.aspx?Action=Update&CartItemID=' + cartitemid + "&Quantity=" + quantity;
            break;
    }

    var myAjax = new Ajax.Request(url, { method: 'post', onSuccess: AjaxGetResult, onFailure: function() { alert('服务器出错') }
    });

}

function AjaxGetResult(originalRequest) {

    if (originalRequest.responseText == "true")
        window.location = "/shop/ShoppingCart.aspx";
}