为什么我的宽到不了300，求解啊
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Document</title>
<style type="text/css">
*{margin:0;padding: 0}
div{width: 100px;height: 100px;background-color: red;position: relative;top: 0px;margin-bottom: 10px;border: 2px solid #000}
</style>
</head>
<body>
<div ></div>
<div ></div>
<div ></div>
<div ></div>
</body>
<script type="text/javascript">
window.onload=function(){
var oDiv=document.getElementsByTagName('div');
for(var i=0;i<oDiv.length;i++){
oDiv[i].timer=null;
oDiv[i].onmouseover=function(){
moveto(this,300);//让宽到300
}
oDiv[i].onmouseout=function(){
moveto(this,100);
}
}
}
function getStyle(obj,style){
if(obj.currentStyle){
return obj.currentStyle[style];
}
else{
return getComputedStyle(obj,false)[style];
}
}
function moveto(obj,itarget){
clearInterval(obj.timer);
obj.timer=setInterval(function(){
var icur=parseInt(getStyle(obj,'width'));
var speed=(itarget-icur)/10;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if(icur==itarget){
clearInterval(obj.timer);
}
else{
obj.style.width=icur+speed+'px'
//console.log(icur+' ,'+speed+' ,'+obj.style.width);
}
},30)
}
</script>
</html>
