pc和移动端识别

  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("xxx");

  }

if (os.isAndroid ||os.isPhone) {

    location.replace('xxx');

}else if (os.isTablet) {

    location.replace('xxx');

  }