PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
getCapabilities 41.0.2272? 13.0.0???? 3.0.0?
length 27.0.1453? 17.0.0 38.0.0??? 3.0.0 9.0.0
prototype 27.0.1453? 13.0.0 38.0.0??? 3.0.0 9.0.0
toString??? 38.0.0?????