为什么我的定时器判断关闭不能关闭？
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>无标题文档</title>
<style type="text/css">
#div1 {width:200px;height:200px;background:red;position:relative;left:-200px;top:0;}
#div1 span{width:20px;height:50px;background:blue;position:absolute;left:200px;top:75px;}
</style>
<script type="text/javascript">
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>
</head>
<body>
<div id="div1"><span id="share">分享</span></div>
</body>
</html>
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