为什么我的代码不运动
<meta http-equiv="Content-Type" content="text/html;charset=utf-8">
<!DOCTYPE html>
<html>
<head>
<style type="text/css">
*{
margin:0;
padding:0;
}
#div1{
height: 500px;
width: 200px;
background-color: blue;
position: relative;
left: -200px;
}
#div1 span{
height: 50px;
width: 20px;
top: 150px;
position: absolute;
background-color: red;
left: 200px;
}
</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>
<title></title>
</head>
<body>
<div id="div1">
<span>
目录
</span>
</div>
</body>
</html>
