Error Domain=NSCocoaErrorDomain Code=3840 "Garbage at end." UserInfo={NSDebugDescription=Garbage at end.}

1.\0 导致JSON无法解析的问题，把\0替换成@""即可。

1     NSString *string = @"{\n\t\"responseType\":\t-1\n}\0";
2     NSData *data = [string dataUsingEncoding:NSUTF8StringEncoding];
3     
4     NSError *error = nil;
5     NSDictionary *dictionary = [NSJSONSerialization JSONObjectWithData:data options:NSJSONReadingAllowFragments error:&error];
6     
7     NSLog(@"%@, %@", dictionary, error);

输出结果：2016-04-26 11:17:58.460 ******[1635:96721] (null), Error Domain=NSCocoaErrorDomain Code=3840 "Garbage at end." UserInfo={NSDebugDescription=Garbage at end.}

文章来自：http://www.cnblogs.com/pinweyshg/p/5434369.html