JavaScript获取扫码枪相关资料

https://blog.csdn.net/jiongxian1/article/details/78906124

https://blog.csdn.net/jifengdalu/article/details/83031664

https://blog.csdn.net/phoenix_shine/article/details/70245444

https://blog.csdn.net/x1172031988/article/details/74010653