<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>多物体运动</title>
<style>
*{list-style:none;margin:0px;padding:0px;}
ul li{width:200px;
height:100px;
background:yellow;
margin:50px auto;
border:#000000 solid 1px;
filter:alpha(opacity:30);
opacity:0.3;
}
</style>
<script>
window.onload=function(){
var li1=document.getElementById('li1')
li1.onmouseover=function(){
startMove(li1,{'width':400,'height':200,opacity:100,borderWidth:50})
}
li1.onmouseout=function(){
startMove(li1,{'width':200,'height':100,opacity:30,borderWidth:1})
}
}
//var alpha=30
function startMove(obj,json,fn){
clearInterval(obj.timer)
obj.timer=setInterval(function(){
//var icur=0
var flag=true
for(var attr in json){
if(attr=='opacity'){
var icur=Math.round(parseFloat(getStyle(obj,[attr]))*100)
}
else{
var 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.filter='alpha(opacity:'+(icur+speed)+')'
obj.style.opacity=(icur+speed)/100;
}
else{
obj.style[attr]=icur+speed+'px';
}
}
if(flag){
clearInterval(obj.timer)
if(fn){fn()}
}
},50)
}
function getStyle(obj,attr){
if(obj.currentStyle){
return obj.currentStyle[attr]
}
else{
return getComputedStyle(obj,false)[attr]
}
}
</script>
</head>
<body>
<ul>
<li id="li1"></li>
</ul>
</body>
</html>当边框的目标宽度大于8时，运行结果总是比目标宽度小7；当边框的目标宽度小于等于8时，即使原始宽度不是1，运行结果也总是回变成1；导致这个bug的原因是什么额，求大神解答？
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