var CartListViewModel = function () {

        var self = this;

        self.payment = [

                    { name: "", value: 1 },

                    { name: "", value: 2 },

                ];

        self.items = ko.observableArray([]);    // {'id':1,'data':['aa','bb']}

        self.load = function () {

             var data = <%=cartListMap %>;

            var items = new Array();

            for (var i in data) {

                var dataItem = data[i];

                var cartItem = new CartItemViewModel()

                。。。

                items.push(cartItem);

            }

            self.items(items);

        };

        self.TotalSum = function(){

            var totalsum = 0;

            var ilength = this.items().length;

            for(var idx = 0; idx < ilength; idx++)

            {

                var iItem = this.items()[idx];

                if (iItem.selected())

                {

                    totalsum = totalsum + iItem.goodsPrice();

                }

            }    

            return totalsum.toFixed(2);

        }

    }