怎么没有效果，就赐教，谢谢
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style>
body,div,span{
margin: 0;
padding: 0;
}
#div1{
width: 200px;
height: 200px;
background: red;
position: relative;
left: -200px;
top: 0;
}
#div1 span{
width: 20px;
height: 50px;
background: blue;
position: absolute;
left: 200px;
top: 75px;
}
</style>
<script type="text/javascript">
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>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="div1"><span id="share">分享</span></div>
</body>
</html>
