<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style>
* {
margin: 0;
padding: 0;
}
ul, li {
list-style: none;
}
#li1 {
width: 200px;
height: 100px;
border: 4px solid black;
background: yellow;
margin-bottom: 20px;
filter: alpha(opacity:30);
opacity: 0.3;
}
</style>
<script src="move.js"></script>
<script>
window.onload=function(){
var Li = document.getElementById('li1');
Li.onmouseover = function(){
startMove(Li,'width',400,function(){
startMove(Li,'height',200,function(){
startMove(Li,'opacity',100);
});
});
}
Li.onmouseout = function(){
startMove(Li,'opacity',30,function(){
startMove(Li,'height',100,function(){
startMove(Li,'width',200);
});
});
}
}
</script>
</head>
<body>
<ul>
<li id="li1"></li>
</ul>
</body>
</html>下面是js的
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr];
}else{
return getComputedStyle(obj,false)[attr];
}
}
function startMove(obj,attr,iTarget,fn){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
//1.取当前的值
var icur = 0;
if(attr =='opacity'){
icur = Math.round(parseFloat(getStyle(obj, attr))*100);
}else{
icur=parseInt(getStyle(obj, attr));
}
//2.算速度
var speed = (iTarget-icur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
//3.检测停止
if(icur==iTarget){
clearInterval(obj.timer);
}else if(attr=='opacity'){
obj.style.filter = 'alpha(opacity:'+(icur+speed)+')';
obj.style.opacity =(icur+speed)/100;
}else{
obj.style[attr]=icur+speed+"px";
}
},30)
}stone310
慕的地6079101
这都不会
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