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

沒有報錯，只加了一個Li1改變高，但是高沒變寬卻小了，大神幫看看怎么回事，謝謝！

<!DOCTYPE?html>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
	<title></title>
<style?type="text/css">
	*{margin:?0;padding:?0;text-align:?center;line-height:?100px;}
	ul,li{list-style:?none;}
	ul?li{width:?200px;height:?100px;background:?yellow;margin-bottom:?20px;font-size:?12px;color:?blue;border:?2Px?solid?pink;}
</style>
<script?type="text/javascript">
	window.onload=function(){
????/*var?Li=document.getElementsByTagName('li')?
		for(var?i=0;i<Li.length;i++){
			Li[i].timer=null;
			Li[i].onmouseover=function(){
				star(this,400);
			}
			Li[i].onmouseout=function(){
				star(this,200);
			}
		}
	}*/
	var?Li1=document.getElementById('li1');
	var?Li2=document.getElementById('li2');
	var?Li3=document.getElementById('li3');
	Li1.onmouseover=function(){
				star(this,400);
			}
			Li1.onmouseout=function(){
				star(this,100);
			}
	}		
	function?getStyle(obj,attr){
			if(obj.currentStyle){
				return?obj.currentStyle[attr];
			}
		else{
			return?getComputedStyle(obj,false)[attr];
		}
	}	
	var?alpha=30;
	function?star(obj,iTarget){
		clearInterval(obj.timer);
		obj.timer=setInterval(function(){
			var?s=parseInt(getStyle(obj,'height'))
			var?speed=(iTarget-s)/8;
			speed=speed>0?Math.ceil(speed):Math.floor(speed);
			if(s==iTarget){
				clearInterval(obj.timer);
			}else{
				obj.style.width=s+speed+'px';
			}
		},30)
	}
	

</script>	
</head>
<body>
<ul>
	<li?id='li1'>么么噠</li>
	<li?id='li2'>啦啦啦</li>
	<li?id='li3'>啪啪啪</li>
</ul>
</body>
</html>