jQuery基于json与cookie实现购物车的方法

[{'ProductID':ABC','Num':'1'},{'ProductID':DEF,'Num':'2'}]

/*
添加商品及数量到购物车cookie中,返回当前商品在cookie中的总数
*/
function AddToShoppingCar(id, num) {
var _num = 1;
if (num != undefined)
_num = num;
var totalNum = _num; //总数默认为传入参数
var cookieSet = { expires: 7, path: '/' }; //设置cookie路径的
//  $.cookie(cookieProductID, null, cookieSet);//清除Cookie
var jsonStr = "[{'ProductID':'" + id + "','Num':'" + _num + "'}]"; //构造json字符串,id是商品id  num是这个商品的数量
if ($.cookie(cookieProductID) == null) {
$.cookie(cookieProductID, jsonStr, cookieSet); //如果没有这个cookie就设置他
}
else {
var jsonObj = eval('(' + $.cookie(cookieProductID) + ')'); //如果有，把json字符串转换成对象
var findProduct = false;//是否找到产品ID,找到则为TRUE,否则为FALSH
for (var obj in jsonObj) {
if (jsonObj[obj].ProductID == id) {
jsonObj[obj].Num = Number(jsonObj[obj].Num) + _num;
totalNum = jsonObj[obj].Num;
findProduct = true;
break;
}
}
if (findProduct == false) { //没找到,则添加
jsonObj[jsonObj.length] = new Object();
jsonObj[jsonObj.length - 1].ProductID = id;
jsonObj[jsonObj.length - 1].Num = num;
}
$.cookie(cookieProductID, JSON.stringify(jsonObj), cookieSet); //写入coockie  JSON需要json2.js支持
}
return totalNum;
//  alert($.cookie(cookieProductID));
}

//以下为cookie插件代码
jQuery.cookie = function(name, value, options) {
if (typeof value != 'undefined') { // name and value given, set cookie
options = options || {};
if (value === null) {
value = '';
options.expires = -1;
}
var expires = '';
if (options.expires && (typeof options.expires == 'number' || options.expires.toUTCString)) {
var date;
if (typeof options.expires == 'number') {
date = new Date();
date.setTime(date.getTime() + (options.expires * 24 * 60 * 60 * 1000));
} else {
date = options.expires;
}
expires = '; expires=' + date.toUTCString(); // use expires attribute, max-age is not supported by IE
}
var path = options.path ? '; path=' + options.path : '';
var domain = options.domain ? '; domain=' + options.domain : '';
var secure = options.secure ? '; secure' : '';
document.cookie = [name, '=', encodeURIComponent(value), expires, path, domain, secure].join('');
} else { // only name given, get cookie
var cookieValue = null;
if (document.cookie && document.cookie != '') {
var cookies = document.cookie.split(';');
for (var i = 0; i < cookies.length; i++) {
var cookie = jQuery.trim(cookies[i]);
// Does this cookie string begin with the name we want?
if (cookie.substring(0, name.length + 1) == (name + '=')) {
cookieValue = decodeURIComponent(cookie.substring(name.length + 1));
break;
}
}
}
return cookieValue;
}
};

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