+ (NSString*)deviceString
{// 需要#import "sys/utsname.h"struct utsname systemInfo;uname(&systemInfo);NSString *deviceString = [NSString stringWithCString:systemInfo.machine encoding:NSUTF8StringEncoding];if ([deviceString isEqualToString:@"iPhone1,1"])    return @"iPhone 1G";if ([deviceString isEqualToString:@"iPhone1,2"])    return @"iPhone 3G";if ([deviceString isEqualToString:@"iPhone2,1"])    return @"iPhone 3GS";if ([deviceString isEqualToString:@"iPhone3,1"])    return @"iPhone 4";if ([deviceString isEqualToString:@"iPhone4,1"])    return @"iPhone 4S";if ([deviceString isEqualToString:@"iPhone5,2"])    return @"iPhone 5";if ([deviceString isEqualToString:@"iPhone3,2"])    return @"Verizon iPhone 4";if ([deviceString isEqualToString:@"iPod1,1"])      return @"iPod Touch 1G";if ([deviceString isEqualToString:@"iPod2,1"])      return @"iPod Touch 2G";if ([deviceString isEqualToString:@"iPod3,1"])      return @"iPod Touch 3G";if ([deviceString isEqualToString:@"iPod4,1"])      return @"iPod Touch 4G";if ([deviceString isEqualToString:@"iPad1,1"])      return @"iPad";if ([deviceString isEqualToString:@"iPad2,1"])      return @"iPad 2 (WiFi)";if ([deviceString isEqualToString:@"iPad2,2"])      return @"iPad 2 (GSM)";if ([deviceString isEqualToString:@"iPad2,3"])      return @"iPad 2 (CDMA)";if ([deviceString isEqualToString:@"i386"])         return @"Simulator";if ([deviceString isEqualToString:@"x86_64"])       return @"Simulator";NSLog(@"NOTE: Unknown device type: %@", deviceString);return deviceString;
}