How does JavaScript identify various browsers and platforms

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Identify various browsers and platforms

/ / the running environment is browser let inBrowser = typeof window! = 'undefined';// running environment is Wechat let inWeex = typeof WXEnvironment! =' undefined' & &!! WXEnvironment.platform;let weexPlatform = inWeex & WXEnvironment.platform.toLowerCase (); / / browser UA judges let UA = inBrowser & & window.navigator.userAgent.toLowerCase (); let isIE = UA & & / msie | trident/.test (UA); let isIE9 = UA & UA.indexOf ('msie 9.0') > 0 Let isEdge = UA & & UA.indexOf ('edge/') > 0 android' isAndroid = (UA & & UA.indexOf (' android') > 0) | | (weexPlatform = 'android'); let isIOS = (UA & & / iphone | ipad | ipod | ios/.test (UA)) | | (weexPlatform =' ios'); let isChrome = UA & & / chrome\ /\ d+/.test (UA) & &! what can isEdge;JavaScript do? It can make web pages interactive, such as responding to user clicks and providing users with a better experience. two。 You can process forms, verify user input, and provide timely feedback to save users time. 3. The page can be created dynamically according to the user's operation. 4 using JavaScript, you can set up some temporary information that cookie stores on the browser.

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