PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 33.0.1025 59.0.3071 12.0.0 50.0.0 2.1.0?? 3.0.0 4.0.0
prototype 33.0.1025 59.0.3071 12.0.0 50.0.0 2.1.0?? 3.0.0 4.0.0
toString 33.0.1025??? 2.1.0?? 4.0.0 4.0.0