利用重绘解决IE下JS交互产生的定位重叠等棘手bug

mark 来自：http://www.zhangxinxu.com/wordpress/2013/01/js-paint-ie6-relative-ie8-inline-block-bug-fix/

http://www.zhangxinxu.com/study/201301/repaint-layout-ie6-relative-bug.html