jquery.cookie实现的客户端购物车操作实例

//购物车
var Cart = function () {
 this.Count = 0;
 this.Total = 0;
 this.Items = new Array();
};
//购物车集合对象
var CartItem = function () {
 this.Id = 0;
 this.Name = "";
 this.Count = 0;
 this.Price = 0;
};
 
//购物车操作
var CartHelper = function () {
 this.cookieName = "yxhCart";
 this.Clear = function () {
 var cart = new Cart();
 this.Save(cart);
 return cart;
 };
 //向购物车添加
 this.Add = function (id, name, count, price) {
 var cart = this.Read();
 var index = this.Find(id);
 //如果ID已存在，覆盖数量
 if (index > -1) {
 cart.Total -= (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
 cart.Items[index].Count = count;
 cart.Total += (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
 } else {
 var item = new CartItem();
 item.Id = id;
 item.Name = name;
 item.Count = count;
 item.Price = price;
 cart.Items.push(item);
 cart.Count++;
 cart.Total += (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
 }
 this.Save(cart);
 return cart;
 };
 //改变数量
 this.Change = function (id, count) {
 var cart = this.Read();
 var index = this.Find(id);
 cart.Items[index].Count = count;
 this.Save(cart);
 return cart;
 };
 //移出购物车
 this.Del = function (id) {
 var cart = this.Read();
 var index = this.Find(id);
 if (index > -1) {
 var item = cart.Items[index];
 cart.Count--;
 cart.Total = cart.Total - (((item.Count * 100) * (item.Price * 100)) / 10000);
 cart.Items.splice(index, 1);
 this.Save(cart);
 }
 return cart;
 };
 //根据ID查找
 this.Find = function (id) {
 var cart = this.Read();
 var index = -1;
 for (var i = 0; i < cart.Items.length; i++) {
 if (cart.Items[i].Id == id) {
 index = i;
 }
 }
 return index;
 };
 //COOKIE操作
 this.Save = function (cart) {
 var source = "";
 for (var i = 0; i < cart.Items.length; i++) {
 if (source != "") { source += "|$|"; }
 source += this.ItemToString(cart.Items[i]);
 }
 $.cookie(this.cookieName, source);
 };
 this.Read = function () {
 //读取COOKIE中的集合
 var source = $.cookie(this.cookieName);
 var cart = new Cart();
 if (source == null || source == "") {
 return cart;
 }
 var arr = source.split("|$|");
 cart.Count = arr.length;
 for (var i = 0; i < arr.length; i++) {
 var item = this.ItemToObject(arr[i]);
 cart.Items.push(item);
 cart.Total += (((item.Count * 100) * (item.Price * 100)) / 10000);
 }
 return cart;
 };
 this.ItemToString = function (item) {
 return item.Id + "||" + escape(item.Name) + "||" + item.Count + "||" + item.Price;
 };
 this.ItemToObject = function (str) {
 var arr = str.split('||');
 var item = new CartItem();
 item.Id = arr[0];
 item.Name = unescape(arr[1]);
 item.Count = arr[2];
 item.Price = arr[3];
 return item;
 };
};