ie6下不支持fixed的解决方法

position: fixed;
_position: absolute;
right: 0;
_right: -1px;
top: 80px;
_bottom: auto;
z-index: 2147483647;
_top: expression(eval(document.documentElement.scrollTop + 80));
_top:expression(eval(document.documentElement.scrollTop || document.body.scrollTop) +eval
(document.documentElement.clientHeight || document.body.clientHeight) -520 +'px');

原文地址:https://www.cnblogs.com/fangdx/p/3974897.html