文本消息

{
   "data" : {
      "at_user_list" : ["wxid_xxxxxxx", "wxid_xxxxxxxx"],
      "from_wxid" : "xxxxxxxxx",
      "msg" : "你好，世界",
      "room_wxid" : "xxxxxx@chatroom",
      "to_wxid" : "wxid_xxxxxxxx",
      "wx_type" : 1
   },
   "type" : 11046
}