准备区分节点、参数、返回值的连接，做个备份

Library/Enums/JunctionType.cs

@@ -0,0 +1,31 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace Serein.Library
+{
+    /// <summary>
+    /// 连接点类型
+    /// </summary>
+    public enum JunctionType
+    {
+        /// <summary>
+        /// 当前执行
+        /// </summary>
+        Execute,
+        /// <summary>
+        /// 入参
+        /// </summary>
+        ArgData,
+        /// <summary>
+        /// 返回值
+        /// </summary>
+        ReturnData,
+        /// <summary>
+        /// 下一步要执行的节点
+        /// </summary>
+        NextStep,
+    }
+}