NSDictionary *result = value[@"data"];

     if (![result isKindOfClass:[NSDictionary class]]) {

                    NSLog(@"data 不是字典");

                    if ([result isKindOfClass:[NSString class]]) {

                        NSData *data = http://www.mamicode.com/[(NSString *)result dataUsingEncoding:NSUTF8StringEncoding];// 将数据格式转为UTF8

                        if (data) {

                            result = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:NULL];

                        } else {

                            result = @{};

                        }

                        NSLog(@"解析data: %@", result);

                    } else {

                        result = @{};

                    }

                }

// 数组里面 放了每个字典

commentlist = "[{\"user_id\":\"1\",

                              \"content\":\"[\\u998b\\u5634][\\u6293\\u72c2]\",

                              \"createtime\":\"1970-01-01 08:00:00\",

                              \"realname\":\"\\u90d1\\u98de\"},

                            {\"user_id\":\"1\",

 \"content\":\"[\\u563b\\u563b][\\u563b\\u563b][\\u563b\\u563b]\\u641e\\u5b9a\",\"createtime\":\"1970-01-01 08:00:00\",\"realname\":\"\\u90d1\\u98de\"},                 {\"user_id\":\"1\",\"content\":\"\\u641e\\u5b9a\",\"createtime\":\"1970-01-01 08:00:00\",\"realname\":\"\\u90d1\\u98de\"}]";

     NSDictionary *result = value[@"data"];

     if (![result isKindOfClass:[NSDictionary class]]) {

                    NSLog(@"data 不是字典");

                    if ([result isKindOfClass:[NSString class]]) {

                        NSData *data = http://www.mamicode.com/[(NSString *)result dataUsingEncoding:NSUTF8StringEncoding];// 将数据格式转为UTF8

         }}

    NSData *resData = [[NSData alloc] initWithData:[@"[{\"user_id\":\"1\",\"content\":\"[\\u998b\\u5634][\\u6293\\u72c2]\",\"createtime\":\"1970-01-01 08:00:00\",\"realname\":\"\\u90d1\\u98de\"},{\"user_id\":\"1\",\"content\":\"[\\u563b\\u563b][\\u563b\\u563b][\\u563b\\u563b]\\u641e\\u5b9a\",\"createtime\":\"1970-01-01 08:00:00\",\"realname\":\"\\u90d1\\u98de\"},{\"user_id\":\"1\",\"content\":\"\\u641e\\u5b9a\",\"createtime\":\"1970-01-01 08:00:00\",\"realname\":\"\\u90d1\\u98de\"}]" dataUsingEncoding:NSUTF8StringEncoding]];

    NSMutableDictionary *detailDic;

    NSArray *arr = [NSJSONSerialization JSONObjectWithData:resData options:NSJSONReadingMutableLeaves error:nil];

    int count = arr.count;

    NSMutableArray *tempArray = [NSMutableArray arrayWithCapacity:count];

     for (int i = 0; i < count; i ++) {

        detailDic = [arr objectAtIndex:i];

        TestObject *testObject = [TestObject new];

        testObject.user_id = [detailDic objectForKey:@"user_id"];

        testObject.user_id = [detailDic objectForKey:@"content"];

        testObject.user_id = [detailDic objectForKey:@"createtime"];

        testObject.user_id = [detailDic objectForKey:@"realname"];

        [tempArray addObject:testObject];

    }

iOS返回的不是json格式, 是NSString