<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
<style type="text/css">
*{padding: 0;margin: 0;}
.wrap{
width: 512px;
height: 400px;
border: 3px solid #808080;
position: relative;
overflow: hidden;
margin: 100px auto;
}
.wrap span{
width: 100%;
height: 200px;
position: absolute;
}
.up{
top: 0;
}
.down{
bottom: 0;
}
img{
position: absolute;
top: 0;
left: 0;
}
</style>
</head>
<body>
<div id="box" class="wrap">
<img src="images/mi.png"/ id="xiaomi">
<span class="up" id="picUp"></span>
<span class="down" id="picDown"></span>
</div>
</body>
<script type="text/javascript">
var up = document.getElementById(‘picUp‘);
var down = document.getElementById(‘picDown‘);
var img = document.getElementById(‘xiaomi‘)
var count = 0;
var time = null;
//鼠标移入的时候吧
up.onmouseover = function(){
//不管怎样 上来先清定时器
clearInterval(time);
time = setInterval(function(){
count-=3;
count >= -1070 ? img.style.top = count + ‘px‘: clearInterval(time);
},30)
}
down.onmouseover = function(){
clearInterval(time)
time = setInterval(function(){
count+=1;
count < 0 ? img.style.top = count + ‘px‘: clearInterval(time);
},30)
}
</script>
</html>