PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 27.0.1453 62.0.3202 12.0.0 38.0.0??? 3.0.0 4.0.0
prototype 27.0.1453 62.0.3202 12.0.0 38.0.0? 11.0.0? 3.0.0 4.0.0
toString 42.0.2311?? 38.0.0???? 4.0.0