购物车存放的都是临时的物品，购买之后才产生真正的交易记录，所以这部分数据一般不会放到session中。session还有一个问题就是容易失效，默认20分钟左右会自动销毁。所以存放到cookie中是比较合理的选择。
//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 = $.cookie(‘username‘);
this.Clear = function () {
var cart = new Cart();
this.Save(cart);
return cart;
};
//向购物车添加
this.Add = function (id, name, count, price) {
var cart = this.Read();
var index = this.Find(id);
if(count==0){
this.Del(id);
}else{
//如果ID已存在，覆盖数量
if (index > -1) {
cart.Total -= (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
cart.Items[index].Count = count;
cart.Total += (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
} else {
var item = new CartItem();
item.Id = id;
item.Name = name;
item.Count = count;
item.Price = price;
cart.Items.push(item);
cart.Count++;
cart.Total += (((item.Count * 100) * (item.Price * 100)) / 10000);
// console.log(cart);
// cart.Total += (((cart.Items[index].Count * 100) * (cart.Items[index].Price * 100)) / 10000);
}
cart.Total=Math.round(cart.Total * 100) / 100;
this.Save(cart);
}
return cart;
};
//改变数量
this.Change = function (id, count) {
var cart = this.Read();
var index = this.Find(id);
cart.Items[index].Count = count;
this.Save(cart);
return cart;
};
//移出购物车
this.Del = function (id) {
var cart = this.Read();
var index = this.Find(id);
if (index > -1) {
var item = cart.Items[index];
cart.Count--;
cart.Total = cart.Total - (((item.Count * 100) * (item.Price * 100)) / 10000);
cart.Items.splice(index, 1);
this.Save(cart);
}
return cart;
};
//根据ID查找
this.Find = function (id) {
var cart = this.Read();
var index = -1;
for (var i = 0; i < cart.Items.length; i++) {
if (cart.Items[i].Id == id) {
index = i;
}
}
return index;
};
//COOKIE操作
this.Save = function (cart) {
var source = "";
for (var i = 0; i < cart.Items.length; i++) {
if (source != "") { source += "|$|"; }
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();
function getcookie(){
xc.Add(id,$(‘#title‘).html(),4,$(‘#price‘).html());
console.log(xc.Read());
console.log($(‘#title‘).html());
}
在cookie购物车模板中，把数据渲染出来，并调用js:
<ul class="cart_list_td clearfix" v-for="(sku,index) in cart" id="porcdesc" >
<span id="pro_list">
</span>
</ul>
<script>
console.log(xc.Read())
let pro_list = xc.Read();
var abs = pro_list.Items;
// alert(abs);SS
var username = $.cookie(‘username‘);
// alert(abs[0]["Id"]);
let ul = ‘‘;
for (var i=0;i<abs.length;i++){
alert("123")
ul += ‘<ul class="cart_list_td clearfix" v-for="(sku,index) in cart" id="porcdesc" ><li class="col01"><input type="checkbox" name="product_id" v-model="sku.selected" @change="update_selected(index)" value="‘+abs[i]["Id"]+‘,‘+abs[i]["Id"]+‘,‘+abs[i]["Name"]+‘" onclick="dod()"></li><li class="col02"><img src=""></li><li class="col03" id="prodtit" >‘+abs[i]["Name"]+‘</li><li class="col05" id="prodpic">‘+abs[i]["Price"]+‘元</li><li class="col08">‘+abs[i]["Count"]+‘</li><li id="pkid" value="‘+abs[i]["Id"]+‘"><a @click="on_delete(index)" onclick="delpro(‘+abs[i]["Id"]+‘)">删除</a></li></ul>‘}
ul += ‘‘;
$("#pro_list").html(ul);
</script>
