效果图：
代码如下：
<!doctype html>
<html>
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
*{margin:0; padding:0; list-style:none;}
ul{ overflow:hidden; background:#ccc; width:574px; margin:100px auto; position:relative;}
ul li{ float:left; width:80px; height:40px; text-align:center; line-height:40px; border:1px solid #000; position:relative; z-index:2;}
#block_box{ position:absolute; top:0; left:0; background:#399; z-index:1;}
</style>
<script>
var left = 0;
var iSpeed = 0;
function move(obj,iTarget){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
iSpeed+=(iTarget-left)/5;
iSpeed*=0.75;
left+=iSpeed;
obj.style.left = left+'px';
if(Math.round(iSpeed)==0&&Math.round(left)==iTarget){
clearInterval(obj.timer);
}
},30);
}
window.onload = function(){
var aLi = document.getElementsByTagName('li');
var oBlock = document.getElementById('block_box');
var iNow = 0;
for(var i=0;i<aLi.length-1;i++){
;(function(index){
aLi[i].onmouseover = function(){
//oBlock.style.left = index*aLi[0].offsetWidth+'px';
move(oBlock,index*aLi[0].offsetWidth);
};
aLi[i].onmouseout = function(){
//oBlock.style.left = 0;
move(oBlock,iNow*aLi[0].offsetWidth);
};
aLi[i].onclick = function(){
iNow=index;
};
})(i);
}
};
</script>
</head>
<body>
<ul>
<li>首页</li>
<li>CSS课程</li>
<li>JS课程</li>
<li>HTML5课程</li>
<li>视频教程</li>
<li>课程案例</li>
<li>联系方式</li>
<li id="block_box"></li>
</ul>
</body>
</html>
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