JS+CSS实现带有碰撞缓冲效果的竖向导航条代码

2019-11-20 11:33:54

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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：

在线演示地址如下：

http://demo.VeVB.COm/js/2015/js-css-pzxg-r-nav-style-codes/

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="#">武林网</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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