富有弹性碰撞缓冲的竖向导航条

2024-09-05 12:20:47

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富有弹性碰撞缓冲的竖向JavaScript导航条，当鼠标由上往下滑动时，小块跟着往下掉，是一种反弹的碰撞运动；当鼠标由下往上滑动时，小块跟着往上爬，是一种缓冲运动。同时高亮显示当前菜单。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>富有弹性碰撞缓冲的竖向导航条</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">网站首页</li>	<li>关于我们</li>	<li>资源下载</li>	<li>联系方式</li>    <li id="bar"></li></ul></body></html>

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