JQuery +JSon 购物车

json 格式"[{'ProductID':ABC','Num':'1'},{'ProductID':DEF,'Num':'2'}]";  

 

其中使用到了 $.cookie这个插件。。这个插件的代码在文章的最后

 

/*
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[] = new Object();
            jsonObj[ - 1].ProductID = id;
            jsonObj[ - 1].Num = num;
        }
       
        $.cookie(cookieProductID, (jsonObj), cookieSet);  //写入coockie   JSON需要支持
    }
    return totalNum;
    //    alert($.cookie(cookieProductID));
}

 

 

//以下为cookie插件代码

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