CSS+Js碰撞缓冲效果的竖向导航条

答案：<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<title>碰撞缓冲效果的导航条</title>
<style type="text/css">
* { padding: 0; margin: 0; }
li { list-style: none; }
body { background: #fff; }
ul { width: 202px; margin: 40px auto 0; position: relative; }
li { width: 200px; height: 30px; line-height: 30px; padding-left: 10px; border: 1px solid #ccc; border-left: 3px solid #666; font-size: 14px; color: #333; margin-bottom: 5px; position: relative; z-index: 2; }
a { color: #333; text-decoration: none; }
.active { font-weight: bold; background: #fff0f0; }
#bar { width: 10px; padding-left: 0; background: #cc6699; border: 1px solid #cc6699; position: absolute; top: 0; left: -14px; z-index: 3; }
</style>
<script>
var obj = null;
var aLis = null;
var oBar = null;
var iTime = null;
var iSpeed = 0;
var iAcc = 3;
var onOff = 0;
var iPrev = 0;
var iNext = 0;
function goTime()
{
	for(var i = 0; i < aLis.length; i+=1)
	{
		if(aLis[i] === this)
		{
			var iTarget = (aLis[0].offsetHeight + 5) * i;
			iNext = i;
			onOff = iNext - iPrev;
			if(iTime)
			{
				clearInterval(iTime);
			}
			
			if(onOff>=0)
			{
				iTime = setInterval("elasticity("+ iTarget +")",35);
			}
			else
			{
				iTime = setInterval("postpone("+ iTarget +")",35);
			}
			
			iPrev = iNext;
		}
		aLis[i].className="";
		this.className="active";
	}
}

function elasticity(target)
{
	var top = oBar.offsetTop;
	iSpeed+=iAcc;
	top += iSpeed;
	if(top >= target)
	{
		iSpeed*=-0.7;
		
		if(Math.abs(iSpeed)<=iAcc)
		{
			clearInterval(iTime);
			iTime=null;
		}
		
		top=target;
	}
	oBar.style.top = top + "px";
}

function postpone(target)
{
	if(oBar.offsetTop===target)
	{
		clearInterval(iTime);
		iTime=null;
	}
	else
	{
		iSpeed = (target - oBar.offsetTop)/4;
		oBar.style.top = oBar.offsetTop + iSpeed + "px";
	}
}

window.onload = function(){
	obj = document.getElementById("nav");
	aLis = obj.getElementsByTagName("li");
	oBar = document.getElementById("bar");
	
	for(var i = 0; i < aLis.length; i+=1)
	{
		if(aLis[i].id!="bar")
		{
			aLis[i].onmouseover = goTime;
		}
	}
};
</script>
</head>
<body>
<ul id="nav">
	<li class="active"><a href="http://www.zzzyk.com/">首页</a></li>
	<li><a href="/">站长资源库</a></li>
	<li><a href="/">妙味课程</a></li>
	<li><a href="/">联系方式</a></li>
    <li id="bar">
</ul>
</body>
</html>
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