USBDevice.usbVersionMajor - Web APIs 编辑

Experimental

This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The usbVersionMajor read only property of the USBDevice interface is one of three properties that declare the USB protocol version supported by the device. The other two properties are USBDevice.usbVersionMinor and USBDevice.usbVersionSubminor.

Syntax

var serialNumber = USBDevice.usbVersionMajor

Value

The last of three properties that declare the USB protocol version supported by the device.

Specifications

Browser compatibility

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