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navigator.xr＝ ／[Edge]

＝[object]：[object XRSystem]

ondevicechange＝[object]：null

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

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

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

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

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

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