我的框框不停一直往右走不停，求解答
<!doctype html>
<html>
<head>
<style>
#div1{width:200px; height:200px;background-color:red;position:relative;left:-200px;top:0;}
#div1 span{width:20PX;height:50px; background:blue;position:absolute;left:200px;top:75px;}
</style>
<script>
window.onload=function(){
var oDiv=document.getElementById('div1');
oDiv.onmouseover=function(){
startMove()
}
}
var timer=null;
function startMove(){
clearInterval(timer);
var oDiv=document.getElementById('div1');
timer = setInterval(function(){
if(oDiv.offsetLeft== 0){
clearInterval(timer);
}
else{
oDiv.style.left=oDiv.offsetLeft+10+'px';
}
},30)
}
</script>
<meta charset="utf-8">
<title>无标题文档</title>
</head>
<body >
<div id="div1"><span id="share">分享</span>
</div>
</body>
</html>
