怎么样通过JS+CSS实现鼠标滑过时动态翻滚的导航条效果?

怎么样通过JS+CSS实现鼠标滑过时动态翻滚的导航条效果?

本文实例讲述了JS+CSS实现鼠标滑过时动态翻滚的导航条效果。分享给大家供大家参考。具体如下:

这是一款鼠标悬停时动态翻滚的导航条,注意这里用了两个背景图,请等待网页加载完成或多刷新几次,这个是使用JavaScript实现的,不过代码好像是从jQuery里摘出来的,有点像。

运行效果截图如下:

怎么样通过JS+CSS实现鼠标滑过时动态翻滚的导航条效果?

在线演示地址如下:

http://demo.jb51.net/js/2015/js-css-mouse-over-nav-scroll-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">
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>动态翻滚的导航条</title>
<style type="text/css">
.clear:after{content:"."; display:block; height:0; clear:both; visibility:hidden}.clear{display:inline-block}.clear{display:block}
div#nav{height:32px; background:url(images/YL29.jpg) repeat-x}
div#nav ul{
 width:705px;
 list-style:none;
 margin-top: 0;
 margin-right: auto;
 margin-bottom: 0;
 margin-left: 0px;
}
div#nav ul li{
 float:left;
 height:32px;
 overflow:hidden;
 background-image: url(images/YL30.jpg);
 background-repeat: repeat-y;
 background-position: right 0;
 padding-top: 0;
 padding-right: 1px;
 padding-bottom: 0;
 padding-left: 0px;
 font-family: Arial;
 font-size: 12px;
 line-height: 32px;
 font-weight: bold;
}
div#nav ul li a{
 float:left;
 height:100%;
 width: 77px;
 background:url(images/YL28.jpg) repeat-x;
 color:#fff;
 text-decoration:none;
 padding-top: 0;
 padding-right: 5px;
 padding-bottom: 0;
 padding-left: 5px;
 text-align:center;
}
div#nav ul li a.hover{
 clear:both;
 background-position:0 -32px;
 width: 77px;
}
div#nav ul li.on a{
 background-position:0 -32px;
}
div#nav ul li.nobg{background:none}
/* ]]> */
</style>
</head>
<body>
<div id="nav">
<ul class="clear">
<li><a href="#">路饭</a></li>
<li><a href="#">网页特效</a></li>
<li><a href="#">工具软件</a></li>
<li><a href="#">脚本下载</a></li>
<li><a href="#">菜单导航</a></li>
<li><a href="#">层和布局</a></li>
<li><a href="#">论坛社区</a></li>
<li><a href="#">广告联系</a></li>
<li class="nobg"></li>
</ul>
</div>
<script type="text/javascript"> 
/* <![CDATA[ */
function nav(c, config){
 this.config = config || {speed: 10, num: 2};
 this.container = (typeof(c)=="object") ? c : document.getElementById(c);
 this.lineHeight = this.container.offsetHeight;
 this.scrollTimeId = null;
 var _this = this; 
 this.__construct = function (){
  var inner,el,href;
  inner = _this.container.childNodes[0].innerHTML;
  href = _this.container.childNodes[0].href;
  el = document.createElement("a");
  el.innerHTML = inner;
  el.href = href;
  el.className = 'hover';
  _this.container.appendChild(el);
  _this.container.onmouseover = function (){_this.start()};
  _this.container.onmouseout = function (){_this.end()};
 }();
 this.start = function (){
  _this.clear();
  _this.scrollTimeId = setTimeout(function(){_this.scrollUp();}, _this.config.speed);
 };
 this.end = function (){
  _this.clear();
  _this.scrollTimeId = setTimeout(function(){_this.scrollDown();}, _this.config.speed);
 };
 this.scrollUp = function (){
  var c = _this.container; 
  if(c.scrollTop >= _this.lineHeight){c.scrollTop = _this.lineHeight;return;}
  c.scrollTop += _this.config.num;
  _this.scrollTimeId = setTimeout(function(){_this.scrollUp();}, _this.config.speed);
 };
 this.scrollDown = function (){
  var c = _this.container;
  
  if(c.scrollTop <= 0){c.scrollTop = 0;return;}
  c.scrollTop -= _this.config.num;
  _this.scrollTimeId = setTimeout(function(){_this.scrollDown();}, _this.config.speed);
 };
 this.clear = function (){clearTimeout(_this.scrollTimeId)};
}
(function(){
 var container = document.getElementById('nav');
 var el_li = container.getElementsByTagName('li');
 var arr = [];
 for( var i = 0; i < el_li.length; i++){
  if(el_li[i].className == 'on') continue;
  arr[i] = new nav(el_li[i], {speed: 10, num: 4});
 }
})
();
/* ]]> */
</script>
</body>
</html>

希望本文所述对大家的JavaScript程序设计有所帮助。