var speed = (target - obj.offsetWidth)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth == target){
clearInterval(obj.timer);
}else{
obj.style.width = obj.offsetWidth+speed+"px";
}
for(i=0; i<runs_li.length; i++){
runs_li[i].timer = null;
runs_li[i].onmouseover = function(){
startrun(this,300);
}
runs_li[i].onmouseout = function(){
startrun(this,80);
}
}
<!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>
<style>
body,ul,li{margin:0; padding:0;}
#runs li{width:80px; height:80px; background:#06c; list-style:none;
position:absolute; left:0;}
</style>
<script>
window.onload = function(){
var runs = document.getElementById("runs");
var runs_li = runs.getElementsByTagName("li");
var i=0;
for(i=0; i<runs_li.length; i++){
runs_li[i].timer = null;
runs_li[i].onmouseover = function(){
startrun(this,300);
}
runs_li[i].onmouseout = function(){
startrun(this,80);
}
}
}
function startrun(obj,target){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
var speed = (target - obj.offsetWidth)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(obj.offsetWidth == target){
clearInterval(obj.timer);
}else{
obj.style.width = obj.offsetWidth+speed+"px";
}
document.title = obj.offsetWidth + ',' + target;
},30);
}
</script>
</head>
<body>
<ul id="runs">
<li style="top:0">1</li>
<li style="top:90px;">2</li>
<li style="top:180px;">3</li>
<li style="top:270px;">4</li>
<li style="top:360px;">5</li>
</ul>
</body>
</html>
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