求大神帮忙解答一下
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
*{margin:0; padding:0;}
#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();}
}
function startMove(){
var Odiv=document.getElementById('div1');
setInterval=(function(){
Odiv.style.left=Odiv.offsetLeft+10+'px'},30)
}
</script>
</head>
<body>
<div id="div1"><span id="share">分享</span></div>
</body>
</html>
为什么没有滑动效果？然后就是为什么div1 span的left是200px?
