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JS+CSS实现带有碰撞缓冲效果的竖向导航条代码

2015-09-15 15:48作者:yezheng

本文实例讲述了JS+CSS实现带有碰撞缓冲效果的竖向导航条代码。分享给大家供大家参考。具体如下:

这是一款碰撞缓冲效果的导航条,JavaScript妙味课堂奉献给大家的作品,很不错的竖向菜单,希望大家喜欢。所用技术是JS和CSS。

运行效果截图如下:

JS+CSS实现带有碰撞缓冲效果的竖向导航条代码

具体代码如下:

<!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="#">首页</a></li>

<li><a href="#">脚本之家</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>

希望本文所述对大家的JavaScript程序设计有所帮助。

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