關於「Js get useragent」標籤，搜尋引擎有相關的訊息討論：

Getting the User Agent with JavaScript - jquery - Stack Overflowstackoverflow.com › questions › getting-the-user-agent-wit...Navigator: userAgent property - Web APIs | MDNdeveloper.mozilla.org › References › Web APIs › NavigatorBrowser detection using the user agent - HTTP - MD