技能主要更新，修复卡顿并加入动画，以及各种其他更新。

Assets/songsDatabase/SongDataController/SongButton.cs

@@ -77,7 +77,15 @@ public class SongButton : MonoBehaviour
     {
         Debug.Log("SetButtonData called, songID: " + songID);
 
-        var sd = SongDataLibrary.Instance != null ? SongDataLibrary.Instance.GetSongDataByID(songID) : null;
+        SongData sd = null;
+        if (SongDataLibrary.Instance != null)
+        {
+            sd = SongDataLibrary.Instance.GetSongDataByID(songID);
+        }
+        if (sd == null)
+        {
+            sd = thisSong_so as SongData;
+        }
         if (sd != null)
         {
             if (songNameText != null) songNameText.text = sd.songName;
@@ -206,9 +214,25 @@ public class SongButton : MonoBehaviour
     public void OnSongButtonClick()
     {
         Debug.Log("Song button clicked, song_songSerialID: " + song_songSerialID);
-        SongData selectedSong = SongDataLibrary.Instance.GetSongDataByID(song_songSerialID);
+        SongData selectedSong = null;
+        if (SongDataLibrary.Instance != null)
+        {
+            selectedSong = SongDataLibrary.Instance.GetSongDataByID(song_songSerialID);
+        }
+        if (selectedSong == null)
+        {
+            selectedSong = thisSong_so as SongData;
+        }
         if (selectedSong != null)
         {
+            int bestTotal = 0;
+            int bestDiff = -1;
+            string bestDiffName = "";
+            selectedSong.GetAbsoluteHighestScore(out bestTotal, out bestDiff, out bestDiffName);
+            if (bestDiff >= 0)
+            {
+                selectedSong.thisLevel_selectedDifficultyID = bestDiff;
+            }
             if (currentSelected != null && currentSelected != this)
             {
                 currentSelected.FadeOutSelectedBorder();
@@ -217,7 +241,7 @@ public class SongButton : MonoBehaviour
             FadeInSelectedBorder();
 
             SongDataHolder.SelectedSongData = selectedSong;
-            var selectedInfo = FindObjectOfType<selected_songInfo>();
+            var selectedInfo = Object.FindAnyObjectByType<selected_songInfo>();
             if (selectedInfo != null)
             {
                 selectedInfo.UpdateSelectedSongDisplay();