JS实现文字上下滑动导航特效代码

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以下是 JS实现文字上下滑动导航特效代码的示例演示效果:

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部分效果截图:

HTML代码(index.html):

<!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=gb2312" />
<title>JS实现文字上下滑动导航</title>
<style type="text/css"> 
body { margin:0; background:#66FF99; }
ul { padding-left:0; margin:0; }
li { list-style:none; }
#nav { height:40px; background:#900; margin-top:50px; }
#nav ul { width:800px; height:40px; margin:0 auto; }
#nav li { float:left; height:40px; }
#nav a { float:left; position:relative; height:40px; overflow:hidden; font-size:14px; color:#e0e03a; text-decoration:none; cursor:pointer; }
#nav strong { float:left; }
#nav span { float:left; padding:0 20px; height:40px; line-height:40px; background:#900; clear:both; white-space:nowrap;}
#nav .active,#nav .current span { background:#600; color:#fff; }
#nav .current .active { color:#e0e03a; }
</style>

<script> 
window.onload=function()
{
	var oDiv=document.getElementById('nav');
	var aStrong=oDiv.getElementsByTagName('strong');
	var aA=oDiv.getElementsByTagName('a');
	var iTarget=oDiv.getElementsByTagName('li')[0].offsetHeight;
 
	for(var i=0; i<aStrong.length; i++)
	{
		aA[i].style.width=aStrong[i].style.width=aStrong[i].getElementsByTagName('span')[0].offsetWidth+'px';
		aStrong[i].style.position='absolute';
		aStrong[i].style.top=aStrong[i].style.left=0;
		
		aStrong[i].onmouseover=function()
		{
			startMove(this, -iTarget);
		};
		aStrong[i].onmouseout=function()
		{
			startMove(this, 0);
		};
	}
};
 
function startMove(obj,target)
{
	clearInterval(obj.iTime);
	obj.iTime=setInterval(function(){
		if(obj.offsetTop==target)
		{
			clearInterval(obj.iTime);
		}
		else
		{
			var iSpeed=(target-obj.offsetTop)/4;
			iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);
			obj.style.top=obj.offsetTop+iSpeed+'px';
		}
	}, 30);
}
</script>
</head>
 
<body>
 
<div id="nav">
	<ul>
		<li class="current">
			<a href="#">
				<strong>
					<span>首页</span>
					<span class="active">首页</span>
				</strong>
			</a>
		</li>
		<li>
			<a href="#">
				<strong>
					<span>前端开发课程</span>
					<span class="active">前端开发课程</span>
				</strong>
			</a>
		</li>
		<li>
			<a href="#">
				<strong>
					<span>妙味视频教程</span>
					<span class="active">妙味视频教程</span>
				</strong>
			</a>
		</li>
		<li>
			<a href="#">
				<strong>
					<span>周末班上课安排</span>
					<span class="active">周末班上课安排</span>
				</strong>
			</a>
		</li>
		<li>
			<a href="#">
				<strong>
					<span>结课标准</span>
					<span class="active">结课标准</span>
				</strong>
			</a>
		</li>
		<li>
			<a href="#">
				<strong>
					<span>联系妙味</span>
					<span class="active">联系妙味</span>
				</strong>
			</a>
		</li>
	</ul>
</div>
</body>
</html>

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