public static void ImportXObject()
    {
        if (!Directory.Exists(Application.streamingAssetsPath))
        {
            Directory.CreateDirectory(Application.streamingAssetsPath);
        }
        string path = EditorUtility.OpenFilePanel("导入到", Application.streamingAssetsPath, "xo");

        if (path != null && path.Length > 0)
        {
            XOFormat.Import(path);
        }
    }
 public static void ExportXObject()
 {
     if (Selection.gameObjects.Length > 0)
     {
         if (!Directory.Exists(Application.streamingAssetsPath))
         {
             Directory.CreateDirectory(Application.streamingAssetsPath);
         }
         string path = EditorUtility.SaveFilePanel("导出到", Application.streamingAssetsPath, "xo文件", "xo");
         if (path != null && path.Length > 0)
         {
             XOFormat.Export(path, Selection.gameObjects);
         }
     }
     else
     {
         Debug.Log("未选择任何物体");
     }
 }