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

为什么我的代码在0那个位置听不下来？

<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>Title</title>
<style>
#div1{
width: 200px;
height: 200px;
background: yellow;
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();
}
}
var timer =null;
function startMove() {
clearInterval(timer);
var oDiv=document.getElementById('div1');
timer=setInterval(function () {
if(oDiv.offsetLeft==0){
clearInterval(timer);
}
else {
oDiv.style.left = oDiv.offsetLeft + 1 + 'px';
}
},30)
}

</script>

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