数组转字符串逗号隔开

  //数组转字符串[1,2,3]=>"1,2"
            acTiveArrStringFun: function(obj) {
                var arr = [];
                if (obj != null && obj.length != 0) {
                    for (var i = 0; i < obj.length; i++) {
                        arr.push(obj[i]);
                    }
                }
                return arr.toString();
            }