NSString *appKey()

{

// // 获取系统当前时间

// NSDate * date = [NSDate date];

// NSTimeInterval sec = [date timeIntervalSinceNow];

// NSDate * currentDate = [[NSDate alloc] initWithTimeIntervalSinceNow:sec];

//

// //设置时间输出格式：

// NSDateFormatter * df = [[NSDateFormatter alloc] init ];

// [df setDateFormat:@"yyyyMMddHHmmss"];

// NSString * na = [df stringFromDate:currentDate];

//取毫秒

NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];

[dateFormatter setDateStyle:NSDateFormatterMediumStyle];

[dateFormatter setTimeStyle:NSDateFormatterShortStyle];

[dateFormatter setDateFormat:@"SSSSMMddHHmmss"];//毫秒-月-日-时-分秒

NSString *time = [dateFormatter stringFromDate:[NSDate date]];

NSString *appKey = [NSString stringWithFormat:@"%@%@",time,[[NSString stringWithFormat:@"ecej12345678%@",time] md5HexDigest]];

return appKey;

}