功能：可以更方便的使用这个js插件来操作本地购物车数据，准确的说，是键值对，key_Val的格式；
运用：引用Jquery脚本库，然后再引用BuyCarHelper.js
方法列表：
1、加入或者修改购物车：返回true或者false
BuyCar.AddOrUpdate('商品ID',商品数量)；
2、删除一条购物车数据：返回true或者false
BuyCar.Delete('商品ID');
3、清空购物车
BuyCar.DeleteAll();
4、获取购物车所有数据：返回js数组对象，item格式：113322312_5
BuyCar.QueryAll();
5、根据商品ID返回购物车中的数量：返回数字num,不存在返回0
BuyCar.GetNum('商品ID');
6、返回购物车所有商品ID,格式：1,2
BuyCar.GetSysNos();
var BuyCar = {
Key: "BuyCarInfo",
AddOrUpdate: function (sysno, num) {
if (sysno == null || sysno == "" || sysno == undefined) {
return false;
}
if (num == null || num == "" || num == undefined || parseInt(num) <= 0) {
num = 1;
}
var exis = false;
var obj = BuyCar.QueryAll();
if (obj == null || obj.length <= 0) {
obj.push(sysno + "_" + num);
}
for (var i = 0; i < obj.length; i++) {
var item = obj[i];
var sys = item.split("_")[0];
if (sys == sysno) {
exis = true;
obj[i] = sysno + "_" + num;
}
}
if (exis == false) {
obj.push(sysno + "_" + num);
}
var str = JSON.stringify(obj);
localStorage.setItem(BuyCar.Key, str);
return true;
},
Delete: function (sysno) {
if (sysno == null || sysno == "" || sysno == undefined) {
return false;
}
var obj = BuyCar.QueryAll();
if (obj.length <= 0) {
return true;
}
var newobj = [];
$(obj).each(function () {
var item = this;
var sys = item.split("_")[0];
var num = item.split("_")[1];
if (sys != sysno) {
newobj.push(item);
}
});
var str = JSON.stringify(newobj);
localStorage.setItem(BuyCar.Key, str);
return true;
},
DeleteAll: function () {
localStorage.setItem(BuyCar.Key, "[]");
return true;
},
QueryAll: function () {
var data = localStorage.getItem(BuyCar.Key);
var obj = JSON.parse(data);
if (obj == null || obj.length <= 0) {
return [];
}
return obj;
},
GetNum: function (sysno) {
var num = 0;
if (sysno == null || sysno == "" || sysno == undefined) {
return num;
}
var obj = BuyCar.QueryAll();
if (obj.length <= 0) {
return num;
}
$(obj).each(function () {
var item = this;
var sys = item.split("_")[0];
var sysnum = item.split("_")[1];
if (sys == sysno) {
num = sysnum;
}
});
return num;
},
GetSysNos: function () {
var sysnos = "";
var obj = BuyCar.QueryAll();
$(obj).each(function () {
var item = this;
var sys = item.split("_")[0];
sysnos += "," + sys;
});
return sysnos.substr(1);
}}
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