唯一设备标识符。保证对于每个设备都是唯一的（只读）。
**iOS**：在 iOS7 之前的设备上，该属性返回 MAC 地址的哈希值。在 iOS7 设备上，该属性返回 UIDevice identifierForVendor，或者，如果由于任何原因而失败，则返回 ASIdentifierManager advertisingIdentifier。
**Android**：SystemInfo.deviceUniqueIdentifier 始终返回 ANDROID_ID 的 md5 形式。（请参阅 https://developer.android.com/reference/android/provider/Settings.Secure.html#ANDROID_ID）。
**Windows 应用商店应用程序**：使用 AdvertisingManager::AdvertisingId 返回唯一设备标识符，如果禁用了“电脑设置 > 隐私 > 允许应用使用我的广告标识符了解对各应用的体验(关闭此功能将重置你的 ID)”，Unity 将回退到 HardwareIdentification::GetPackageSpecificToken().Id。
**Windows 独立平台**：返回从 **Computer System Hardware Classes** 获取的串接字符串的哈希值 (https://msdn.microsoft.com/en-us/library/windows/desktop/aa389273(v=vs.85).aspx):
Win32_BaseBoard::SerialNumber
Win32_BIOS::SerialNumber
Win32_Processor::UniqueId
Win32_DiskDrive::SerialNumber
Win32_OperatingSystem::SerialNumber
在不支持该属性的平台上，将返回 SystemInfo.unsupportedIdentifier。
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