就是运行不出来，求解
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8">
<title>无解</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 type="text/javascript">
window.onload=function(){
var da=document.getElementById("div1");
da.onmouseover=function(){
startMove(0);
}
da.onmouseout=function(){
startMove(-200);
}
}
var timer=null;
function startMove(iTarget){
clearInterval(timer);
var da=document.getElementById("div1");
timer=setInterval(function(){
var speed=0;
if(da.offsetLeft<iTarget){
speed=10;
}
else{
speed=-10;
}
if(da.offsetLeft==iTarget){
clearInterval(timer);
}
else{
da.style.width=da.offsetLeft+speed+"px";
}
},30);
}
</script>
</head>
<body>
<div id="div1">
<span id="share">分享</span>
</div>
</body>
</html>
