HTML：
CSS：
Fixed {
position: fixed;
_position: absolute;
z-index: 100;
bottom: 70px;
left: 50%;
margin-left: 530px;
_bottom: auto;_top:
expression(document.documentElement.scrollTop+document.documentElement.clientHeight-this.offsetHeight-70);
width: 50px;
text-indent: -40000px;
background: #fff}
/置顶 end/
Js：
100 ? $('#goTop').show() : $('#goTop').hide();
if (!/msie 6/i.test(navigator.userAgent)) {
if ($(window).height() - (referFooter.offset().top - $(window).scrollTop()) > e.data.fixedOffsetBottom) {
$('#Fixed').css('bottom',$(window).height() - (referFooter.offset().top - $(window).scrollTop()))
} else {
$('#Fixed').css('bottom',e.data.fixedOffsetBottom)
}
}
});
$('#goTop').click(function() {
$('body,html').stop().animate({
'scrollTop': 0,'duration': 100,'easing': 'ease-in'
})
});
});
/置顶功能 end/
