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来源：2-1 JS速度动画

gzw19931217

2014-09-24 17:28

请大神帮我看下这个代码为什么动不起来

<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>js动画制作</title>
</head>
<style>
body,div,span{
   margin:0;
   padding:0;

}
#div1{
   height: 200px;
   width: 200px;
   background-color: #333;
   position: relative;
   left: -200px;
   top: 0;
}
#div1 span{
   height:50px;
   width:20px;
   background-color:#666;
   position: absolute;
   left:200px;
   top:75px;
}
</style>
<script>
window.onload = function(){
   var oDiv = document.getElementById('div1');
   oDiv.onmouseover = function(){
       startMove(0);
       }
   oDiv.onmouseout = function(){
       startMove(-200);
       }
}
var timer = null;
function startMove(iTarget){
   clearInterval(timer);
   var oDiv = document.getElementById('div1');
   timer = setInterval(function(){
       var speed=0;
       if(oDiv.offsetLeft<iTaget){speed = 10;}
       else{speed = -10;}
       if(oDiv.offsetLeft == iTarget){
           clearInterval(timer);
           }
       else{
       oDiv.style.left = oDiv.offsetLeft+ speed +'px';
           }
       },30)
}
</script>

<body>

<div id="div1"><span id="share">分享</span></div>
</body>
</html>