function getStyle(obj,attr){
if(obj.currentStyle)
{
return obj.currentStyle[attr];
}
else
{
return getComputedStyle(obj,false)[attr];
}
}
function startMove(obj,json,fn){
clearInterval(obj.timer);
obj.timer = setInterval(function(){
for(var attr in json){
var iCur = 0;
var flag = true;
if(attr == 'opacity'){
iCur = Math.round(parseFloat(getStyle(obj,attr))*100);
}else{
iCur = parseInt(getStyle(obj,attr));
}
var speed = (json[attr]-iCur)/8;
speed = speed>0?Math.ceil(speed):Math.floor(speed);
if(iCur != json[attr]){
flag = false;
}
if(attr == 'opacity'){
obj.style.opacity = (iCur + speed)/100;
obj.style.filter = 'alpha(opactiy:'+(iCur+speed)+')';
}else{
obj.style.attr = iCur + speed + 'px';
}
if(flag){
clearInterval(obj.timer);
if(fn){
fn();
}
}
}
}
,30)
}
<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<script src="move.js"></script>
<script>
window.onload = function(){
var div = document.getElementById('box');
div.onmouseover = function(){
startMove(div,{opacity:100,width:400,height:400});
}
}
</script>
<style>
#box{
width: 300px;
height: 300px;
background-color: green;
opacity:0.3;
filter:alpha(opactiy:30);}
</style>
</head>
<body>
<div id="box"></div>
</body>
</html>问一下为什么只修改了opacity的值 没有改变width和height呢？
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