//这是demo01.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=utf-8" />
<title>无标题文档</title>
<link rel="stylesheet" type="text/css" href="css/demo01.css"/>
<script src="js/demo01.js"></script>
</head>
<body>
<ul>
<li></li>
<li></li>
<li></li>
<li></li>
</ul>
</body>
</html>
//demo01.css
*{
margin:0;
padding:0;
}
ul,li{
list-style:none;
}
ul li {
width:200px;
height:100px;
background:#FF0;
margin-bottom:2px;
}
//demo01.js
window.onload = function(){
var lis = document.getElementsByTagName("li");
for(var i = 0 ; i < lis.length ; i++){
lis[i].onmouseover = function(){
startMove(this,400);
}
lis[i].onmouseout = function(){
startMove(this,200);
}
}
var timer = null;
function startMove(obj,target){
clearInterval(timer);
obj.timer = function(){
setInterval(function(){
var speed = (target - obj.offsetWidth)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth == target){
clearInterval(timer);
}else{
obj.style.width = obj.offsetWidth + speed + 'px';
}
},30);
}
}
}
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