<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title></title>
<style type="text/css">
*{margin: 0;padding: 0;text-align: center;line-height: 100px;}
ul,li{list-style: none;}
ul li{width: 200px;height: 100px;background: yellow;margin-bottom: 20px;font-size: 12px;color: blue;border: 2Px solid pink;}
</style>
<script type="text/javascript">
window.onload=function(){
/*var Li=document.getElementsByTagName('li')
for(var i=0;i<Li.length;i++){
Li[i].timer=null;
Li[i].onmouseover=function(){
star(this,400);
}
Li[i].onmouseout=function(){
star(this,200);
}
}
}*/
var Li1=document.getElementById('li1');
var Li2=document.getElementById('li2');
var Li3=document.getElementById('li3');
Li1.onmouseover=function(){
star(this,400);
}
Li1.onmouseout=function(){
star(this,100);
}
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
var alpha=30;
function star(obj,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var s=parseInt(getStyle(obj,'height'))
var speed=(iTarget-s)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(s==iTarget){
clearInterval(obj.timer);
}else{
obj.style.width=s+speed+'px';
}
},30)
}
</script>
</head>
<body>
<ul>
<li id='li1'>么么哒</li>
<li id='li2'>啦啦啦</li>
<li id='li3'>啪啪啪</li>
</ul>
</body>
</html>已解决，最下面的宽没改成高.......