Fix #46

修复资源包初始化失败之后，再次初始化提示异常的问题。

Assets/YooAsset/Runtime/AssetsPackage.cs

@@ -78,6 +78,9 @@ namespace YooAsset
 		/// </summary>
 		public InitializationOperation InitializeAsync(InitializeParameters parameters)
 		{
+			// 注意：WebGL平台因为网络原因可能会初始化失败！
+			ResetInitializeAfterFailed();
+
 			// 检测初始化参数合法性
 			CheckInitializeParameters(parameters);
 
@@ -127,6 +130,20 @@ namespace YooAsset
 			initializeOperation.Completed += InitializeOperation_Completed;
 			return initializeOperation;
 		}
+		private void ResetInitializeAfterFailed()
+		{
+			if(_isInitialize && _initializeStatus == EOperationStatus.Failed)
+			{
+				_isInitialize = false;
+				_initializeStatus = EOperationStatus.None;
+				_initializeError = string.Empty;
+				_bundleServices = null;
+				_assetSystemImpl = null;
+				_editorSimulateModeImpl = null;
+				_offlinePlayModeImpl = null;
+				_hostPlayModeImpl = null;
+			}
+		}
 		private void CheckInitializeParameters(InitializeParameters parameters)
 		{
 			if (_isInitialize)

Assets/YooAsset/Runtime/YooAssets.cs

@@ -106,6 +106,18 @@ namespace YooAsset
 		/// </summary>
 		/// <param name="packageName">资源包名称</param>
 		public static AssetsPackage GetAssetsPackage(string packageName)
+		{
+			var package = TryGetAssetsPackage(packageName);
+			if (package == null)
+				YooLogger.Warning($"Not found assets package : {packageName}");
+			return package;
+		}
+
+		/// <summary>
+		/// 尝试获取资源包
+		/// </summary>
+		/// <param name="packageName">资源包名称</param>
+		public static AssetsPackage TryGetAssetsPackage(string packageName)
 		{
 			if (_isInitialize == false)
 				throw new Exception($"{nameof(YooAssets)} not initialize !");
@@ -118,8 +130,6 @@ namespace YooAsset
 				if (package.PackageName == packageName)
 					return package;
 			}
-
-			YooLogger.Warning($"Not found assets package : {packageName}");
 			return null;
 		}