向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除|赢在IT，Playin' with IT,Focus on Killer Application,Marketing Meets Technology.

   1.  if (typeof window.pageYOffset != ’undefined’) {
   2. bodyTop = window.pageYOffset;
   3. } else if (typeof document.compatMode != ’undefined’ && document.compatMode != ’BackCompat’) {
   4. bodyTop = document.documentElement.scrollTop;
   5. }
   6. else if (typeof document.body != ’undefined’) {
   7. bodyTop = document.body.scrollTop;
   8. }

# if (typeof window.pageYOffset != ‘undefined’) {
#                 bodyTop = window.pageYOffset;
#             } else if (typeof document.compatMode != ‘undefined’ && document.compatMode != ‘BackCompat’) {
#                 bodyTop = document.documentElement.scrollTop;
#             }
#             else if (typeof document.body != ‘undefined’) {
#                 bodyTop = document.body.scrollTop;
#             }