這個是iPad訪問help頁面時，apple官方ipad跳轉的JavaScript代碼。

function browser_check() {

 var originalWindowLocation = window.location + "";
 var newWindowLocation;
 var server = 'http://' + window.location.hostname + '/ipad';
 var regexiPad = new RegExp(/iPad/);
  if( regexiPad.exec(navigator.userAgent) ) {
  newWindowLocation = server + '/4/interface/';
 } else {
  newWindowLocation = 'http://support.apple.com/manuals/ipad/';
 }
 if( -1 == originalWindowLocation.indexOf(newWindowLocation) ) {
  window.location = newWindowLocation + window.location.hash;
 }
}
browser_check();