需求场景是用户在小程序中编辑相片，编辑好后，使用打印机把相片打印到相纸上面
https://developers.weixin.qq.com/blogdetail?action=get_post_info&docid=7e85fa4514a56b7928646f96dd4bcabe&highline=%E8%93%9D%E7%89%99%E6%89%93%E5%8D%B0%E6%9C%BA
没试过，据说蓝牙也可以
https://www.jianshu.com/p/55c37312373c
https://www.jb51.net/article/170589.htm
