a problem of jQuery's fadeIn() in iPhone (Version>=1.8.0)

a problem of jQuery's fadeIn() in iPhone (Version>=1.8.0)

I found a special bug of fadeIn. It blinks twice in iphone browser,and In PC browser is ok.
This bug appear in the version 1.8.0 and higher. In 1.7.2 is ok.

The link:

Short link:
http://t.cn/zTqdW1z

Use Iphone's safari, and press the browser Back and Forward buttons after clicked the button.

The code:
  2. <!DOCTYPE html>
  3. <html>
  4. <head>
  5. <meta name="viewport" content="width=device-width,initial-scale=1,user-scalable=no" />
  6. <script type="text/javascript" src="http://code.jquery.com/jquery-1.9.1.js"></script>
  7. </head>
  8. <body>
  9. <div style="position:fixed;top:0;left:0;right:0;bottom:0;">
  10.     <div id="aaaaaa" style="position:absolute;">
  11.     aaaaaaaaaaaaa<br />
  12.     aaaaaaaaaaaaa<br />
  13.     aaaaaaaaaaaaa<br />
  14.     </div>
  15. </div>
  16. <script type="text/javascript">
  17. window.onhashchange = function()
  18. {
  19.     setTimeout(function(){
  20.         var obja = $('#aaaaaa');
  21.         if (obja.css('display')=='none')
  22.         {
  23.             obja.fadeIn();
  24.         }
  25.         else
  26.         {
  27.             obja.fadeOut();
  28.         }
  29.     },100);
  30. };

  32. </script>




  37. <div style="position:absolute;top:150px;z-index:10;">
  38. <input type="button" value="click" onclick="document.location.hash='test'" />
  39. Use Iphone's safari, and press the browser Back and Forward buttons after clicked the button.
  40. </div>

  42. </body>
  43. </html>