diff --git a/src/DatabaseServices/HistoricManage.ts b/src/DatabaseServices/HistoricManage.ts
index 417303051..047c26010 100644
--- a/src/DatabaseServices/HistoricManage.ts
+++ b/src/DatabaseServices/HistoricManage.ts
@@ -3,6 +3,8 @@ import { CADFile } from './CADFile';
 import { CADObject } from './CADObject';
 import { CommandHistoryRecord } from './CommandHistoryRecord';
 
+//TODO:对于空的新建命令,应该支持不清空后续命令. 比如切换相机或者切换视图.
+
 //历史记录管理
 @Factory
 export class HistoricManage extends CADObject
@@ -89,16 +91,13 @@ export class HistoricManage extends CADObject
         this.EndCmd();
         let historyRec = this.historyRecord[this.curIndex];
         if (!historyRec)
-        {
             return false;
-        }
         this.doing = true;
         for (let [id, recList] of historyRec.HistoryList)
         {
-            let obj = id.Object;
             for (let i = recList.length; i--;)
             {
-                obj.ApplyPartialUndo(recList[i].undoData);
+                id.Object.ApplyPartialUndo(recList[i].undoData);
             }
         }
         this.curIndex--;
@@ -109,16 +108,13 @@ export class HistoricManage extends CADObject
     {
         let historyRec = this.historyRecord[this.curIndex + 1];
         if (!historyRec)
-        {
             return false;
-        }
         this.doing = true;
         for (let [id, recList] of historyRec.HistoryList)
         {
-            let obj = id.Object;
             for (let rec of recList)
             {
-                obj.ApplyPartialUndo(rec.redoData);
+                id.Object.ApplyPartialUndo(rec.redoData);
             }
         }
         this.curIndex++;