#define MILog_ON (当发布时把此句注释掉即可)
#if defined(MILog_ON)
#define MILog(format, ...) NSLog(@"%s %d\t" format, __func__, __LINE__, ##__VA_ARGS__)
#else
#define MILog(format, ...)
#endif
#define MILogBegin MILog(@"BEGIN")
#define MILogEnd MILog(@"END")