PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 27.0.1453 59.0.3071 12.0.0 59.0.0??? 3.0.0 5.0.0
prototype 27.0.1453 59.0.3071 12.0.0 59.0.0??? 3.0.0 5.0.0
toString 44.0.2403????????