新增了对NodeaAction特性标记方法中，对params可变参数的支持

NodeFlow/Env/FlowEnvironment.cs

@@ -1316,7 +1316,28 @@ namespace Serein.NodeFlow.Env
         }
 
 
-
+        /// <summary>
+        /// 改变可选参数的数目
+        /// </summary>
+        /// <param name="nodeGuid">对应的节点Guid</param>
+        /// <param name="isAdd">true，增加参数；false，减少参数</param>
+        /// <param name="paramIndex">以哪个参数为模板进行拷贝，或删去某个参数（该参数必须为可选参数）</param>
+        /// <returns></returns>
+        public async Task<bool> ChangeParameter(string nodeGuid, bool isAdd, int paramIndex)
+        {
+            var nodeModel = GuidToModel(nodeGuid);
+            if (nodeModel is null) return false;
+            bool isPass;
+            if (isAdd)
+            {
+                isPass = nodeModel.MethodDetails.AddParamsArg(paramIndex);
+            }
+            else
+            {
+                isPass = nodeModel.MethodDetails.RemoveParamsArg(paramIndex);
+            }
+            return isPass;
+        }
 
 
         /// <summary>