各位老师同学，帮我看看我的代码哪里出了问题可以吗，鼠标移入有反应，鼠标移出没反应？
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>速度动画</title>
<style type="text/css">
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>
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=(iTarget-oDiv.offsetLeft)/20;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
if (oDiv.offsetLeft=iTarget){
clearInterval(timer);
}else{oDiv.style.left=oDiv.offsetLeft+speed+"px";
}
},30)
}
</script>
</head>
<body>
<div id="div1">
<span>分享</span>
</div>
</body>
</html>
