修复

static/imservice.js

@@ -800,7 +800,6 @@ IMService.prototype.listenerGroupPresence = function () {
     this.im.on(GoEasyIM.EVENT.GROUP_PRESENCE, (event) => {
         //更新在线用户数
         this.room.onlineUsers.count = event.groupOnlineCount;
-
         if (event.action == 'join' || event.action == 'online') {
             let userData = JSON.parse(event.userData);
             //添加新用户
@@ -887,6 +886,7 @@ IMService.prototype.subscribeRoomMessage = function (room, user) {
      this.subscribePresence(this.room.id);
      //订阅聊天室消息
     //  this.subscribeRoomMessage(this.room.id);
+    this.initialOnlineUsers(this.room.id)
     this.im.subscribeGroup([this.room.id])
         .then(result => {
             console.log('消息订阅成功')