1.横向滚动，这个方法是见过最简洁的了。
#demo {
background: #FFF;
overflow: hidden;
border: 1px dashed #CCC;
width: 1170px;border: 1px solid red;
margin-left: 10px;
}
#demo img {
border: 3px solid #F2F2F2;
}
#indemo {
float: left;
width: 800%;
}
#demo1 {
float: left;
}
#demo2 {
float: left;
}
<div id="demo" >
<div id="indemo">
<div id="demo1">
<a href="#"><img src="../Images/jiameng/1.png" border="0" /></a>
<a href="#"><img src="../Images/jiameng/2.png" border="0" /></a>
<a href="#"><img src="../Images/jiameng/3.png" border="0" /></a>
<a href="#"><img src="../Images/jiameng/4.png" border="0" /></a>
<a href="#"><img src="../Images/jiameng/5.png" border="0" /></a>
<a href="#"><img src="../Images/jiameng/6.png" border="0" /></a>
<a href="#"><img src="../Images/jiameng/7.png" border="0" /></a>
<a href="#"><img src="../Images/jiameng/8.png" border="0" /></a>
</div>
<div id="demo2"></div>
<script>
var speed = 10;
var tab = document.getElementById("demo");
var tab1 = document.getElementById("demo1");
var tab2 = document.getElementById("demo2");
tab2.innerHTML = tab1.innerHTML;
function Marquee() {
if (tab2.offsetWidth - tab.scrollLeft <= 0) {
tab.scrollLeft -= tab1.offsetWidth; } else {
tab.scrollLeft += 2; }
}
var MyMar = setInterval(Marquee, speed);
tab.onmouseover = function () { clearInterval(MyMar); };
tab.onmouseout = function () { MyMar = setInterval(Marquee, speed); };
</script>
滚动平滑。昨天用的时候怎么就是不滚动，然后改了tab.srollLeft的增加的值就好了。
2.浮动导航：
<script type="text/javascript" src="http://misc.jjcdn.com/resource/js/waypoints.js"></script>
<script type="text/javascript">
//浮动导航 waypoints.js
$('#main-nav-holder').waypoint(function (event, direction) {
$(this).parent().toggleClass('sticky', direction === "down");
event.stopPropagation();
});
</script>