                        課程
                    
                        /前端開發(fā)
                        
                            /JavaScript
                        
                        /JS動(dòng)畫效果

為什么動(dòng)不了啊

<!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>xxxx</title>
<style?type="text/css">
body{
	margin:0;padding:?0;
}
#dds{
	width:?400px;
	height:?400px;
	position:?relative;
	background-color:?yellow;
	left:?-400px;
}
#dd{
	background-color:?blue;
	height:?50px;
	width:?50px;
	position:?absolute;
	left:?400px;
	top:?175px;
}
</style>
<script?type="text/javascript">
	window.onload=function?()?{
		var?odiv=document.getElementById('dds');
		odiv.ommouseover?=?function(){
			startMove(400);
		}
		odiv.ommouseout?=?function(){
			startMove(0);
		}
	}
	var?timer?=?null;
	function?startMove(itarget){
		clearInterval(timer);
		var?odiv?=?document.getElementById('dds');
		timer?=?setInterval(function(){
			var?speed=0;
			if?(odiv.offsetLeft>itarget)?{
					speed=-10;
				}
			else{
					speed=10;
				}
			if?(odiv.offsetLeft==itarget)?{
				clearInterval(timer);
			}
			else{
				odiv.style.left=odiv.offsetLeft+speed+'px';
			}
		},30)
	}
</script>

</head>
<body>
	<div?id='dds'>
		<span?id='dd'>分享</span>
	</div>
</body>
</html>