BrowserVersionOwn?TypeAs String
Chrome85.0.4183???
Edge86.0.622???
Firefox68.0.0???
Firefox79.0.0ownfunctionfunction FileSystemFileEntry() { [native code] }
IE10.0.0???
Safari10.1.2???
Safari12.0.0ownfunctionfunction FileSystemFileEntry() { [native code] }

PropertiesChromeEdgeFirefoxIESafari
length?? 79.0.0? 12.0.0
prototype?? 79.0.0? 12.0.0