<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>任意属性值（一）</title>
</head>
<style>
*{margin: 0;padding: 0}
ul li{
list-style: none;
}
li{
width: 200px;
height: 100px;
background: yellow;
margin-bottom: 10px;
border: 5px solid #000;
}
</style>
<script>
window.onload=function(){
var Li1=document.getElementById("li1");
var Li2=document.getElementById("li2");
Li1.onmouseover=function(){
startMove(this,"height",400);
}
Li1.onmouseout=function(){
startMove(this,"height",100);
}
Li2.onmouseover=function(){
startMove(this,"width",400);
}
Li2.onmouseout=function(){
startMove(this,"width",200);
}
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}
else{
return getComputedStyle(obj,false)[attr];
}
}
function startMove(obj,attr,iTarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var icur=parseInt(getStyle(obj.attr));
var speed=(iTarget-icur)/8;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(icur==iTarget){
clearInterval(obj.timer);
}
else{
obj.style[attr]=icur+speed+"px";
}
},30);
}
</script>
<body>
<ul>
<li id="li1"></li>
<li id="li2"></li>
</ul>
</body>
</html>
