web聊天室监听不触发

        // 监控聊天室消息
        onRoomMsg() {
            var that = this
            JIM.onRoomMsg(function(data) {
                if (data) {
                    console.log("监听成功", data.content.from_id)
                    that.chatRoomList = that.chatRoomList.concat(data)
                    var length = that.chatRoomList.length - 1
                    that.minMsg = "msg" + length
                }
            });
        },