JS to determine whether from the mobile phone and jump to the mobile version

Function ismobilephone ()  {function getcookie (sName)  {var sCookies =  document.cookie ;if  ("string"  == typeof (sName))  {var sRE =  "(?:;  )?" +sname+ "= ([^;] *);?"  ;var rere = new regexp (SRE)  ;if  (Rere.test (scookies))  {return  decodeURIComponent (regexp["$"])  ;}  else {return null ;}}  else {return scookies ;}} var pcpagetip =  ' You are going to jump to the computer version of the webpage, will use more mobile Internet traffic, whether continue? ';var curl = window.location.href;var referrer = document.referrer;var  mindex =  ' http://m.a.com/?v=1 '; var mflag = window.location.hash, pcmflag =  getcookie (' PCM ');/*if (mflag ==  ' #m ') {if  (confirm (Pcpagetip))  {return;}} */        var useragent = navigator.useragent;         if (userAgent) {useragent = useragent.touppercase (), if (Useragent.indexof ("PAD") >-1) {                  return;             }var mobilephonelist = ["IOS", "IPHONE", " ANDROID "," Windows phone "];for (var i=0,len=mobilephonelist.length;i<len;i++) {if (UserAgent.indexOf ( Mobilephonelist[i]) (>-1) {function ispcpage (URL)  {var pcdomains = [' sale.a.com ',   ' pinpaijie.a.com '];for  (var i = 0, len = pcdomains.length; i  < len; i++)  {if  (Url.indexof (pcdomains[i])  != -1)  return true ;} Return false;}         var murl = curl.replace (/sale\.a\.com\/act/, ' M.a.com/sale/act ');// no sale m & mcif (Ispcpage (murl)  | |  mFlag == ' #m '  | |  pcmFlag ==  ' 1 ')  {if  (confirm (Pcpagetip))  {return;}  else {if  (referrer && referrer !=  ")  {if  (referrer  === curl)  {window.location.href = mindex;return;}  else {window.location.href = referrer;return;}}  else {window.location.href = mindex;return;}}}  M pageif  (Murl.indexof (' m.a.com ')  != -1)  {window.location.href =  Murl;return;}         }              }         }     }   ismobilephone ();

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JS to determine whether from the mobile phone and jump to the mobile version