diff --git a/chat.py b/chat.py
index fa2511b1401dbb9eeab47547557b9f84039fa10a..d88e5a0ea664116d3b77383f4f234b49d5564fcc 100644
--- a/chat.py
+++ b/chat.py
@@ -43,12 +43,25 @@ async def echo(websocket):
         event = json.loads(message)
         #根据api-token查找房间号
         room_id = name[websocket]['room_id']
+        #历史记录数量
+        if "history_num" in event["type"]:
+            if room_id in history : 
+                # h = history[room_id][start*end - end:start*end]
+                h = len(history[room_id])
+            else :
+                # h = []
+                h = 0;
+            r = {'type':'history_num','content':h}
+            message = json.dumps(r,ensure_ascii=False)
+            await websocket.send(message)
         #历史记录
         if "history" in event["type"]:
             start = int(event['page'])
             end = int(event['page_num'])
+            num = int(event['num'])
             if room_id in history : 
-                h = history[room_id][start*end - end:start*end]
+                n = history[room_id][:num]
+                h = n[start*end - end:start*end]
             else :
                 h = []
             r = {'type':'history','content':h}