void ProcessFinishedOperation(AssetBundleOperation operation)
        {
            AssetBundleDownloadOperation download = operation as AssetBundleDownloadOperation;

            if (download == null)
            {
                return;
            }

            if (string.IsNullOrEmpty(download.error))
            {
                mLoadedAssetBundles.Add(download.AssetbundleName, download.assetBundleRes);
            }
            else
            {
                string msg = string.Format("Failed downloading bundle {0} from {1}: {2}",
                                           download.AssetbundleName, download.GetSourceURL(), download.error);
                mDownloadingErrors.Add(download.AssetbundleName, msg);
            }

            mDownloadingBundles.Remove(download.AssetbundleName);
        }
        /// <summary>
        /// 从给定资产包开始一个场景的加载操作。
        /// </summary>
        public static AssetBundleOperation LoadSceneAsync(string _assetbundleName, string _sceneName, bool _isAdditive)
        {
            AssetBundleOperation operation = null;

            if (Application.platform == RuntimePlatform.WindowsEditor)
            {
#if UNITY_EDITOR
                if (SimulateAssetBundleInEditor)
                {
                    operation = new AssetBundleSceneSimulationOperation(_assetbundleName, _sceneName, _isAdditive);
                }
#endif
            }
            else
            {
                LoadAssetBundle(_assetbundleName);
                operation = new AssetBundleSceneOperation(_assetbundleName, _sceneName, _isAdditive);
                mProgressOperations.Add(operation);
            }

            return(operation);
        }