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navigator.usb ／[Edge]

＝[object]：[object USB]

onconnect＝[object]：null

ondisconnect＝[object]：null

getDevices＝[function]：function getDevices() { [native code] }

requestDevice＝[function]：function requestDevice() { [native code] }

addEventListener＝[function]：function addEventListener() { [native code] }

dispatchEvent＝[function]：function dispatchEvent() { [native code] }

removeEventListener＝[function]：function removeEventListener() { [native code] }