Json 형식 전환string

function Serialize(obj) {

            switch (obj.constructor) {

                case Object:

                    var str = "{";

                    for (var o in obj) {

                        str += "\""+o + "\":" + Serialize(obj[o]) + ",";

                    }

                    if (str.substr(str.length - 1) == ",")

                        str = str.substr(0, str.length - 1);

                    return str + "}";

                    break;

                case Array:

                    var str = "[";

                    for (var o in obj) {

                        str += Serialize(obj[o]) + ",";

                    }

                    if (str.substr(str.length - 1) == ",")

                        str = str.substr(0, str.length - 1);

                    return str + "]";

                    break;

                case Boolean:

                    return "\"" + obj.toString() + "\"";

                    break;

                case Date:

                    return "\"" + obj.toString() + "\"";

                    break;

                case Function:

                    break;

                case Number:

                    return "\"" + obj.toString() + "\"";

                    break;

                case String:



                    return "\"" + obj.toString() + "\"";

                    break;

            }



        }