Json中相同或者重复记录的值相加组成新的Json

var data = [
    {"Networking": "WiFi", "count_value": "2000"},
    {"Networking": "WiFi", "count_value": "2890"},
    {"Networking": "WiFi", "count_value": "2900"},
    {"Networking": "CellNetwork", "count_value": "3010"},
    {"Networking": "CellNetwork", "count_value": "3000"}
];
//现在想要把Networking中都为Wifi和CellNetwork的count_value合并
var obj = {};
for (var i in data) {
    if (obj[data[i].Networking]) {
        obj[data[i].Networking].value = Number(obj[data[i].Networking].value) + Number(data[i].count_value);
    } else {
        obj[data[i].Networking] = {
            value: data[i].count_value
        }
    }
}

//结果

console.log(JSON.stringify(obj));

                                              {"WiFi":{"value":7790},"CellNetwork":{"value":6010}}

for (var i in obj) {
    console.log(i);
    console.log(obj[i].value)
}                          //结果为：  WiFi  7790
                            //        CellNetwork  6010