PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 15.0.874? 12.0.0 24.0.0 2.1.0?? 3.0.0 4.0.0
prototype 15.0.874? 12.0.0 24.0.0 2.1.0 11.0.0? 3.0.0 4.0.0
toString 15.0.874?? 24.0.0??? 4.0.0 4.0.0