请教一个页面显示的问题_html/css_WEB-ITnose

function fBrowserRedirect(){      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";      if(bIsIpad){          var sUrl = location.href;              if(!bForcepc){              window.location.href = "http://ipad.mail.163.com/";  //转向pad对应网址        }      }      if(bIsIphoneOs || bIsAndroid){          var sUrl = location.href;              if(!bForcepc){              window.location.href = "http://smart.mail.163.com/";  //转向手机对应网址        }      }      if(bIsMidp||bIsUc7||bIsUc||bIsCE||bIsWM){          var sUrl = location.href;              if(!bForcepc){              window.location.href = "http://m.mail.163.com/";          }      }  }