Detect if a USB device is plugged in Javascript from browser

Question

是否有基于 Javascript 的机制，我可以通过浏览器检测用户是否插入了特定的 USB 设备？

Answer 1

For security reasons, JavaScript in web browsers provides only restricted access to computer resources. It is not possible to store files in an arbitrary folder, start applications or communicate with a USB device.

But there are some exceptions :

• In legacy browsers such as IE6 ~ IE8 you can use ActiveX objects or Java applets to achieve this .
• Use a chrome.usb API .
• Write a browser plugin using NPAPI , ( Here, it is not for long though )

Answer 2

Your javascript code is sand boxed and therefore cannot access system resources such as usb devices.

I think the only way to access the USB devices would be to write a browser plugin. How to get USB devices List from Browser