请帮忙看看 为什么物体运动停不下来
<!DOCTYPE HTML>
<html >
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>js运动</title>
<style>
*{margin:0px;padding:0px;}
#div1{
height:200px;
width:200px;
background-color:red;
position:relative;
left:-200px;
}
#share{
height:50px;
background-color:blue;
position:absolute;
top:100px;
left:200px;
color:#FFFFFF;
}
</style>
<script>
var timer=null;
window.onload=function(){
var oDiv=document.getElementById('div1');
oDiv.onmouseover=startMove;
}
function startMove(){
clearInterval(timer);
var oDiv=document.getElemenstById('div1');
timer=setInterval(function(){
if ((oDiv.style.left = oDiv.offsetLeft)) {
clearInterval(timer);
} else {
oDiv.style.left = oDiv.offsetLeft + 1 + 'px';
}
},30);
}
</script>
</head>
<body>
<div id="div1">
<span id="share">分享</span>
</div>
</body>
</html>请帮忙看为什么停不下来？？？
