用window.onscroll事件加scrollby
function FloatDiv()
{
document.getElementById("Hid_ScrollTop").value = document.documentElement.scrollTop;
}
window.onscroll= FloatDiv;
function SetScrollPostion()
{
var vScrollTop = document.getElementById("Hid_ScrollTop").value if(vScrollTop != "")
scrollBy(0,vScrollTop);
}
在onload事件里调用SetScrollPostion(),