                        课程
                    
                        /前端开发
                        
                            /JavaScript
                        
                        /JS动画效果

为什么这样不行啊？

<!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=gb2312" />
<title>无标题文档</title>
<style  type="text/css">
*{margin:0;padding:0;}
#fuck{
top=0;
width:200px;
height:200px;
background:#00FFFF;
position:relative;
left:-200px;
}
#share{
                width: 20px;
                height: 50px;
                background: blue;
                position: absolute;
                left: 200px;
                top:75px;
                
 }
</style>
</head>
<body>
<script>
window.onload=function(){
 var fuck=document.getElementById("fuck");
 fuck.onmouseover=function(){
 outmove(0);
 }
 fuck.onmouseout=function(){
  outmove(-200); 
 }
 }
 var timer= null;
 var speed=0;
function outmove(iTarget){
var fuck=document.getElementById("fuck");
clearInterval(timer);
timer=setInterval(function(){
if(fuck.offsetLeft<iTarget){
Math.ceil(speed=(iTarget-fuck.offsetLeft)/30);
}else{
Math.floor(speed=(iTarget-fuck.offsetLeft)/30);
}
if(fuck.offsetLeft==iTarget){
clearInterval(timer);
}else{
fuck.style.left=fuck.offsetLeft+speed+"px";
}
},30);
}

</script>
<div id="fuck">
<span id="share">分享</span>
</div>
</body>
</html>
为什么这样，达不到老师那样的效果？