问题
There's a pretty big bug in Safari 7 on both Mac and iOS that's hard to find anything on, but is pretty easy to fix.
In some situations when using position:fixed, Safari 7 fails to draw part of the page when scrolling. This can be seen at http://ruelculture.com/glitchy.html by clicking on the arrow, waiting a bit and trying to scroll back up.
回答1:
To fix this, force hardware acceleration on the disappearing element by adding the following CSS hack:
-webkit-transform: translate3d(0, 0, 0);
See it in the wild at http://ruelculture.com/. That's it!
回答2:
There is also position:-webkit-sticky;, which is made specifically for this problem. I've had mixed results with my answer and @Mike Marcacci's solution (flickering, elements disappearing when you reach the bottom of the page). I'm still trying to find the perfect solution to this problem. HTML5 Rocks =>
来源：https://stackoverflow.com/questions/19172249/parts-of-page-are-invisible-when-scrolling-on-safari-7-with-positionfixed-eleme