//创建BmobQuery实例，指定对应要操作的数据表名称

    BmobQuery *query = [BmobQuery queryWithClassName:className];

    //按updatedAt进行降序排列

    [query orderByDescending:@"updatedAt"];

    //返回最多20个结果

    query.limit = ;

    //执行查询

    [query findObjectsInBackgroundWithBlock:^(NSArray *array, NSError *error) {

        //处理查询结果

        for (BmobObject *obj in array) {

            News *info    = [[News alloc] init];

            if ([obj objectForKey:@"title"]) {

                info.title    = [obj objectForKey:@"title"];

            }

            if ([obj objectForKey:@"describe"]) {

                info.content  = [obj objectForKey:@"describe"];

            }

            if ([obj objectForKey:@"phone"]) {

                info.phoneNum = [obj objectForKey:@"phone"];

            }

            info.time     = [_dateFormatter stringFromDate:obj.updatedAt];

            [_infoMutableArray addObject:info];

        }

        [_tableView reloadData];

    }];