购物车不仅仅可以存在服务端的rredis中和MySQL中

也可以存在前端的cookie中

//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 = "{$member_id}_repast_cart";

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);

if(count==0){

this.Del(id);

}else{

//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 += (((item.Count * 100) * (item.Price * 100)) / 10000);

// console.log(cart);

// cart.Total += (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);

}

cart.Total=Math.round(cart.Total * 100) / 100;

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;

};

};

//调用

var xc=new CartHelper();

//id,名称,数量，价格    数量为0的话直接删除

xc.Add(id,c_name,num,price);

这个方法会用的话非常简单~·