PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 15.0.874 62.0.3202 12.0.0 18.0.0 2.1.0?? 3.0.0 6.2.0
prototype 15.0.874 62.0.3202 12.0.0 5.0.0 2.1.0 9.0.0? 3.0.0 6.2.0
toString 15.0.874?? 24.0.0 2.1.0?? 4.0.0?