JavaScript实现动态导航
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>导航菜单</title>
<style type="text/css">
.titleStyle{
background-color:#006600;color:#ffffff;border-top:1px solid #FFFFFF;font-size:9pt;cursor:hand;
}
.contentStyle{
background-color:#eeffee;color:blue;font-size:9pt;
}
a{
color:blue;
}
body{
font-size:9pt;
}
</style>
</head>
<body>
<script language="JavaScript">
<!--
var layerTop=20; //菜单顶边距
var layerLeft=30; //菜单左边距
var layerWidth=140; //菜单总宽
var titleHeight=20; //标题栏高度
var contentHeight=200; //内容区高度
var stepNo=10; //移动步数，数值越大移动越慢
var itemNo=0;runtimes=0;
document.write('<span id=itemsLayer style="position:absolute;overflow:hidden;border:1px solid #008800;left:'+layerLeft+';top:'+layerTop+';width:'+layerWidth+';">');
function addItem(itemTitle,itemContent){
itemHTML='<div id=item'+itemNo+' itemIndex='+itemNo+' style="position:relative;left:0;top:'+(-contentHeight*itemNo)+';width:'+layerWidth+';"><table width=100% cellspacing="0" cellpadding="0">'+
'<tr><td height='+titleHeight+' onclick=changeItem('+itemNo+') class="titleStyle" align=center>'+itemTitle+'</td></tr>'+
'<tr><td height='+contentHeight+' class="contentStyle">'+itemContent+'</td></tr></table></div>';
document.write(itemHTML);
itemNo++;
}
//添加菜单标题和内容，可任意多项，注意格式：
addItem('欢迎','<BR><img src="hehe.gif"/>');
addItem('网页陶吧','<center><a href="#">网页工具</a> <BR><BR><a href="#">技术平台</a> <BR><BR><a href="#">设计理念</a> <BR><BR><a href="#">更多</a></center>');
addItem('美工教室','<center><a href="#">平面设计 </a> <BR><BR><a href="#">三维空间</a> <BR><BR><a href="#">设计基础</a> <BR><BR><a href="#">更多..</a></center>');
addItem('Flash','<center><a href="#">基础教程</a> <BR><BR><a href="#">技巧运用</a> <BR><BR><a href="#">实例剖析</a> <BR><BR><a href="#">更多..</a></center>');
addItem('多媒体','<center><a href="#">DIRECTOR</a> <BR><BR><a href="#">Authorware</a> <BR><BR><a href="#">更多..</a></center>');
addItem('精品赏析','<center><a href="#">设计精品</a></center>');
document.write('</span>')
document.all.itemsLayer.style.height=itemNo*titleHeight+contentHeight;
toItemIndex=itemNo-1;onItemIndex=itemNo-1;
function changeItem(clickItemIndex){
toItemIndex=clickItemIndex;
if(toItemIndex-onItemIndex>0) moveUp(); else moveDown();
runtimes++;
if(runtimes>=stepNo){
onItemIndex=toItemIndex;
runtimes=0;}
else
setTimeout("changeItem(toItemIndex)",10);
}
function moveUp(){
for(i=onItemIndex+1;i<=toItemIndex;i++)
eval('document.all.item'+i+'.style.top=parseInt(document.all.item'+i+'.style.top)-contentHeight/stepNo;');
}
function moveDown(){
for(i=onItemIndex;i>toItemIndex;i--)
eval('document.all.item'+i+'.style.top=parseInt(document.all.item'+i+'.style.top)+contentHeight/stepNo;');
}
changeItem(0);
//-->
</script>
</body>
