PropertiesChromeCriOSEdgeFirefoxGooglebotIEOperaSafariSamsungBrowser
length 41.0.2272? 75.0.111 27.0.0 2.1.0?? 3.0.0?
prototype 41.0.2272? 75.0.111 27.0.0 2.1.0?? 3.0.0?
toString??? 27.0.0?????