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; }; };