Printinfg到两台打印机
餐厅有收银台，二楼有厨房。收银员Pc通过位于二楼的局域网和打印机连接到打印机。收银台PC有网页界面，我需要用3个按钮制作网页界面，当我点击第一个按钮时，收据直接打印到本地PC，当我点击第二个按钮时，收据打印到二楼的打印机上，当我在第三个按钮上打印时，收据同时打印在两台打印机上。如何在不显示对话框的情况下执行此操作
我尝试过：
我尝试了几种方法，但每种方式向我显示打印机的对话框
There are Cashier at a restaurant but the kitchen at the second floor. Cashier Pc connected to the printer by usb and printer by LAN which located on the second floor . Cashier PC has web interface,I need to make web interface with 3 buttons , when I click on the first button, the receipt printed directly to the local PC , when I click On the second button the receipt printed to the Printer on the second floor, when I printed on the third button , the receipt printed on the two printers at the same time. How I can do this without showing the dialog box
What I have tried:
I have tried several ways but each way show to me the dialog box of the printer
我尝试了几种方法，但每种方式向我显示打印机的对话框
I have tried several ways but each way show to me the dialog box of the printer
这是原则：webapps没有控制权客户端计算机无法直接访问客户端硬件。
未经客户明确同意，Webapps无法在客户端打印机上打印。
webapp可以在网络上打印打印机，仅当服务器位于同一网络上，并且是执行打印的服务器。
That is the principle: webapps don't have control of client side computer and don't have direct access to client hardware.
Webapps can't print on client printer without explicit client consent.
The webapp can print on network printer only if server is on same network, and it is the server that do the printing.