AppDelegate *appDelegate = [[UIApplicationsharedApplication] delegate];        MKNetworkEngine *engine = [[MKNetworkEnginealloc] initWithHostName:appDelegate.baseUrlcustomHeaderFields:nil];    NSMutableDictionary *dic = [[NSMutableDictionaryalloc] init];    [dic setValue:@"kendeji"forKey:@"user.userCode"];    [dic setValue:@"888888"forKey:@"user.password"];        MKNetworkOperation *op = [engine operationWithPath:@"/dianCaiLogin.action"params:dic httpMethod:@"POST"];    [op addCompletionHandler:^(MKNetworkOperation *operation) {        NSLog(@"[operation responseData]-->>%@", [operation responseString]);        NSError *error;        NSData * data = [[operation responseString] dataUsingEncoding:NSUTF8StringEncoding];        NSDictionary *dic = [NSJSONSerializationJSONObjectWithData:data options:NSJSONReadingMutableContainerserror:&error];                if(!dic ||error){            NSLog(@"解码失败！");                    }else{            BOOL isSuccess = [dic objectForKey:@"success"];            if(isSuccess){                UIAlertView * alert = [[UIAlertViewalloc] initWithTitle:@""message:@"登录成功!"delegate:selfcancelButtonTitle:@"好"otherButtonTitles:nil, nil];                [alert show];            }            NSLog(@"%@", [dic objectForKey:@"success"]);        }            }errorHandler:^(MKNetworkOperation *errorOp, NSError* err) {        NSLog(@"MKNetwork request error : %@", [err localizedDescription]);    }];    [engine enqueueOperation:op];