上下移动（鼠标在上半部分往上走，反之相反）
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<!DOCTYPE html>
<html>
<head lang="en">
<meta charset="UTF-8">
<title></title>
<style>
*{
margin:0;
padding:0;
}
.xiaomi{
width:512px;
height:400px;
overflow:hidden;
position:relative;
margin:100px auto;
}
img{
position:absolute;
top:0;
}
.xiaomi span{
width:100%;
height:200px;
display:block;
position:absolute;
cursor:pointer;
}
.up{
top:0;
}
.down{
bottom:0;
}
</style>
</head>
<body>
<div class="xiaomi" id="xiaomi">
<img src="images/mi.png" id="pic"/>
<span class="up" id="picUp"></span>
<span class="down" id="picDown"></span>
</div>
</body>
</html>
<script src="../public.js"></script>
<script>
var timerUp = null,timerDown = null;
var pic = $id("pic");
$id("picUp").onmouseover = function(){
timerUp = setInterval( function(){
if( pic.offsetTop < -(1470-400) ){
clearInterval( timerUp );
}else{
pic.style.top = pic.offsetTop - 2 + "px";
}
} , 30 )
}
$id("picUp").onmouseout = function(){
clearInterval( timerUp );
}
$id("picDown").onmouseover = function(){
timerDown = setInterval( function(){
if( pic.offsetTop > 0 ){
clearInterval( timerDown );
}else{
pic.style.top = pic.offsetTop + 3 + "px";
}
},30 )
}
$id("picDown").onmouseout = function(){
clearInterval( timerDown );
}
</script>
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