【吉光片羽】js横向滚动与浮动导航

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>