哪出错了？？
<!DOCTYPE HTML>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>relative样式</title>
<style type="text/css">
div{
width: 200px;
height: 200px;
background: red;
}
</style>
<script type="text/javascript">
window.onload=function(){
startMove();
}
function startMove(){
setInterval(function(){
var oDiv=document.getElementById("div1");
oDiv.style.width=oDiv.offsetWidht-1+'px'
}
,30)
}
</script>
</head>
<body>
<div id="div1"></div>
</body>
</html>
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JavaScript