fix #178

Assets/YooAsset/Runtime/OperationSystem/AsyncOperationBase.cs

@@ -78,6 +78,7 @@ namespace YooAsset
 
 		internal abstract void Start();
 		internal abstract void Update();
+		internal virtual void Abort() { }
 
 		internal void SetPackageName(string packageName)
 		{
@@ -90,6 +91,7 @@ namespace YooAsset
 				Status = EOperationStatus.Failed;
 				Error = "user abort";
 				YooLogger.Warning($"Async operaiton has been abort : {this.GetType().Name}");
+				Abort();
 			}
 		}
 		internal void SetFinish()
@@ -102,6 +104,7 @@ namespace YooAsset
 		internal void SetStart()
 		{
 			Status = EOperationStatus.Processing;
+			Start();
 		}
 
 		/// <summary>

Assets/YooAsset/Runtime/OperationSystem/OperationSystem.cs

@@ -59,16 +59,15 @@ namespace YooAsset
 					break;
 
 				var operation = _operations[i];
+				if (operation.IsDone == false)
+					operation.Update();
+
 				if (operation.IsDone)
 				{
 					// 注意：如果业务端发生异常，保证异步操作提前移除。
 					_operations.RemoveAt(i);
 					operation.SetFinish();
 				}
-				else
-				{
-					operation.Update();
-				}
 			}
 		}
 
@@ -116,7 +115,6 @@ namespace YooAsset
 			_newList.Add(operation);
 			operation.SetPackageName(packageName);
 			operation.SetStart();
-			operation.Start();
 		}
 	}
 }