向下读取时，有数据就调用readAll

src/views/IM/current-session/index.vue

@@ -287,13 +287,6 @@ export default {
       },
       deep: true
     },
-    currentSession: {
-      handler(sSession) {
-        console.log('in currentSession watch!!!!!');
-        this.readAllMsg();
-      },
-      deep: true
-    }
   },
 
   created() {
@@ -495,7 +488,7 @@ export default {
       this.POST("/im/msg/forward", params).then(res => {
         if (res.code === "000000") {
           this.convertMessageList(res.data, 2);
-          if(this.currentSession.unreadCount) {
+          if(res.data.length) {
             this.readAllMsg();
           }
         } else {