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

求教，不知道問題在那，跟著老師步驟走的，效果卻不一樣，只是會晃動一下

<!DOCTYPE?html>
<html>
<head>
<meta?http-equiv="Content-Type"?content="text/html;?charset=utf-8">
	<title>動畫</title>
	<style?type="text/css">
		*{
margin:?0;
padding:?0;
}
#move{
width:?300px;
margin:?10px?auto;
border:?1px?solid?#ccc;
background-color:?pink;
}
#move?a{
display:?inline-block;
width:?58px;
height:?25px;
border:?1px?solid?#ddd;
border-radius:?3px;
background-color:?#fff;
text-align:?center;
margin:?10px?17px;
position:?relative;
padding-top:?40px;
color:?#9c9c9c;
font-size:?12px;
text-decoration:?none;
line-height:?25px;
overflow:?hidden;
}
#move?a?i{
position:?absolute;
top:?20px;
left:?0;
display:?inline-block;
width:?100%;
text-align:?center;
filter:?alpha(opacity=100);
opacity:?1;
}
#move?a:hover{
color:?#F00;
}
#move?img{
border:?none;
}
	</style>
	<script?type="text/javascript">
		window.onload=function(){
			var?M=document.getElementById('move');
			var?A=M.getElementsByTagName('a');
			for(var?i=0;i<A.length;i++){
				A[i].onmouseover=function(){
					var?T=this.getElementsByTagName('i')[0];
					star(T,{top:-25,opacity:0},function(){
						T.style.top=30+'px';
						star(T,{top:20,opacity:100});
					});
				}
			}
		}
		function?getStyle(obj,attr){
			if(obj.currentStyle){
				return?obj.currentStyle[attr];
			}
		else{
			return?getComputedStyle(obj,false)[attr];
		}
	}	
	var?alpha=30;
	function?star(obj,json,fn){
	
		clearInterval(obj.timer);
		obj.timer=setInterval(function(){
			var?flag=true;
			for(var?attr?in?json)
		{		
			var?s=0;
			if(attr=='opacity'){
				?s=Math.round(parseFloat(getStyle(obj,attr))*100);
			}else{
				?s=parseInt(getStyle(obj,attr))
			}
		
			var?speed=(json[attr]-s)/8;
			speed=speed>0?Math.ceil(speed):Math.floor(speed);
			if(s!=json[attr]){
				flag=false;
				}
				if(attr=='opacity'){
					obj.style.filter='alpha(opacity:'+(s+speed)+')';
					obj.style.opacity=(s+speed)/100;
				}else{
				obj.style[attr]=s+speed+'px';}
			if(flag){
			clearInterval(obj.timer);}
			if(fn){
				fn();
			}
		}
		},30)
	}
	</script>
</head>
<body>
<div?id="move">
	<a?href="#"><i><img?src="images/lottery.png"></i><p>彩票</p></a>
	<a?href="#"><i><img?src="images/movie.png"></i><p>電影</p></a>
	<a?href="#"><i><img?src="images/travel.png"></i><p>旅行</p></a>
	<a?href="#"><i><img?src="images/game.png"></i><p>游戲</p></a>
	<a?href="#"><i><img?src="images/insurance.png"></i><p>保險</p></a>
	<a?href="#"><i><img?src="images/food.png"></i><p>外賣</p></a>
</div>
</body>
</html>