public static void show(string position)
    {
      #if UNITY_ANDROID
        HZBannerAdAndroid.show(position, "");
      #endif

      #if UNITY_IPHONE && !UNITY_EDITOR
        HZBannerAdIOS.show(position, "");
      #endif
    }
    public static void showWithTag(string position, string tag)
    {
      #if UNITY_ANDROID
        HZBannerAdAndroid.show(position, tag);
      #endif

      #if UNITY_IPHONE && !UNITY_EDITOR
        HZBannerAdIOS.show(position, tag);
      #endif
    }