JS to determine whether the user's browsing device is a mobile device or a PC

<script type= "Text/javascript" > Function Browserredirect () {var suseragent = navigator.useragent.            toLowerCase ();            var bisipad = Suseragent.match (/ipad/i) = = "ipad";            var Bisiphoneos = Suseragent.match (/iphone os/i) = = "iphone OS";            var BISMIDP = Suseragent.match (/midp/i) = = "MIDP";            var bIsUc7 = Suseragent.match (/rv:1.2.3.4/i) = = "rv:1.2.3.4";            var bisuc = Suseragent.match (/ucweb/i) = = "UCWeb";            var bisandroid = Suseragent.match (/android/i) = = "Android";            var bisce = Suseragent.match (/windows ce/i) = = "Windows CE";            var biswm = Suseragent.match (/windows mobile/i) = = "Windows Mobile";            Document.writeln ("Your browsing device is:"); if (Bisipad | | bisiphoneos | | bismidp | | bIsUc7 | | bisuc | | bisandroid | | bisce | | biswm) {Document.writel            N ("phone");            } else {Document.writeln ("PC");    }} browserredirect (); </scriPt> 

JS Determines whether a user's browsing device is a mobile device or a PC