js判断是pc还是移动端

<script type="text/javascript">
   var os = function () {
       var ua = navigator.userAgent,
       isWindowsPhone = /(?:Windows Phone)/.test(ua),
       isSymbian = /(?:SymbianOS)/.test(ua) || isWindowsPhone,
       isAndroid = /(?:Android)/.test(ua),
       isFireFox = /(?:Firefox)/.test(ua),
       isChrome = /(?:Chrome|CriOS)/.test(ua),
       isTablet = /(?:iPad|PlayBook)/.test(ua) || (isAndroid &&       !/(?:Mobile)/.test(ua)) || (isFireFox && /(?:Tablet)/.test(ua)),
       isPhone = /(?:iPhone)/.test(ua) && !isTablet,
       isPc = !isPhone && !isAndroid && !isSymbian;

       return {
              isTablet: isTablet,
              isPhone: isPhone,
              isAndroid: isAndroid,
              isPc: isPc
       };
   }();
   if(os.isPc){
      location.replace("http://xxxxxxxxxxxxx");
   }

   if (os.isAndroid || os.isPhone) {
      location.replace('http://xxxxxxxxxxxxx');
　　}else if (os.isTablet) { 
　　　　location.replace('http://xxxxxxxxxxxx');
　　} 

</script>