鼠标移上小图片，大图片从小图片的中间向两边拉开显示js效果

一个图片列表有5张小图片，鼠标移上去，如果对应的小图片里又大图的话，那么这张大图就小图片的中间向两边拉开显示，且铺满覆盖住这5张小图片，鼠标离开后，又会收缩回小图片里面，怎么实现？求这种效果，谢谢大神了。

解决方案 »

免费领取超大流量手机卡，每月29元包185G流量+100分钟通话, 中国电信官方发货

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style type="text/css">
img{
width:40px;
height:40px;
}
div{
width:240px;
height:40px;
}
</style>
<script type="text/javascript">
function init(){
var imgs=document.images;
for(var i=0;i<imgs.length;i++){
imgs[i].onmouseover=function(){
var img=new Image();
img.src=this.src;
var p=this.parentNode;
img.style.width='240px';
img.style.height='40px';
img.style.position='absolute';
img.style.left='0px';
p.appendChild(img);
img.onmouseout=function(){
p.removeChild(img);
}
}
}
}
window.onload=init;
</script>
</head><body>
<div>
<img src="a.jpg" />
<img src="biggerl.jpg" />
<img src="border.png" />
<img src="building.jpg" />
<img src="close.png" />
</div>
</body>
</html>
不是很明白你的意思
http://jsbin.com/uqacup/110/edit
就是一个图片列表，有一种是上下滑动显示的，有一种是垂直居中Ul上下拉开显示的，怎么实现的？
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>无标题文档</title>
<style>
ul,li{
list-style:none;
padding:0;
margin:0;
}
#ul1{
width:1000px;
height:300px;
overflow:hidden;
margin:10px auto;
position:relative;
}
#ul1 li{
width:190px;
height:300px;
float:left;
margin-right:10px;
}
.sbox{
width:190px;
height:300px;
overflow:hidden;
position:relative;
}
.sma{
height:600px;
overflow:hidden;
color:#fff;
position:absolute;
top:0;
}
.a1{
background:#ff6600;
width:190px;
height:300px;
overflow:hidden;
}
.a2{
background:#377f03;
width:190px;
height:300px;
overflow:hidden;
}
.bigBox{
height:0px;
width:1000px;
background:#990000;
position:absolute;
z-index:2;
top:0;
left:0;
overflow:hidden;
}
.bigBox img{
width:1000px;
height:300px;
}
</style>
<script>
//class
function getByClass(oParent, sClass)
{
var aEle=oParent.getElementsByTagName('*');
var aResult=[];
var re=new RegExp('\\b'+sClass+'\\b', 'i');
var i=0;
for(i=0;i<aEle.length;i++)
{
if(re.test(aEle[i].className))
{
aResult.push(aEle[i]);
}
}
return aResult;
}
//getstyle
function getStyle(obj, attr)
{
if(obj.currentStyle)
{
return obj.currentStyle[attr];
}
else
{
return getComputedStyle(obj, false)[attr];
}
}
//move
function startMove(obj, json, fn)
{
clearInterval(obj.timer);
obj.timer=setInterval(function (){
var bStop=true;
for(var attr in json)
{
var iCur=0;if(attr=='opacity')
{
iCur=parseInt(parseFloat(getStyle(obj, attr))*100);
}
else
{
iCur=parseInt(getStyle(obj, attr));
}var iSpeed=(json[attr]-iCur)/8;
iSpeed=iSpeed>0?Math.ceil(iSpeed):Math.floor(iSpeed);if(iCur!=json[attr])
{
bStop=false;
}if(attr=='opacity')
{
obj.style.filter='alpha(opacity:'+(iCur+iSpeed)+')';
obj.style.opacity=(iCur+iSpeed)/100;
}
else
{
obj.style[attr]=iCur+iSpeed+'px';
}
}
if(bStop)
{
clearInterval(obj.timer);if(fn)
{
fn();
}
}
}, 30)
}window.onload=function(){
var aUl=document.getElementById('ul1');
var aLi=aUl.getElementsByTagName('li');
var sImg=getByClass(aUl,'sma');
var i=0;
var iNow=0;
var iNow2=0;
for(i=0;i<aLi.length;i++){
aLi[i].index=i;
aLi[i].onmouseover=function(){
var aImg=this.getElementsByTagName('img');
var bImg=getByClass(this,'bigBox');
iNow=this.index;

if(aImg.length>1){
if(bImg){
startMove(bImg[iNow],{height:300});
}
}else{
startMove(sImg[iNow],{top:-aLi[0].offsetHeight})
}
};
aLi[i].onmouseout=function(){
var aImg=this.getElementsByTagName('img');
var bImg=getByClass(this,'bigBox');
iNow=this.index;

if(aImg.length>1){
startMove(bImg[iNow],{height:0});
}else{
startMove(sImg[iNow],{top:0})
}
};
};
};
</script>
</head><body>
<ul id="ul1">
<li>
<div class="sbox">
<div class="sma">
<div class="a1">正常显示层</div>
<div class="a2">上下切换显示层</div>
</div>
</div>
</li>
<li>
<div class="a1">正常显示层</div>
<div class="bigBox">从ul的中间上下拉开显示层</div>
</li>
<li>
<div class="sbox">
<div class="sma">
<div class="a1">正常显示层</div>
<div class="a2">上下切换显示层</div>
</div>
</div>
</li>
<li>
<div class="sbox">
<div class="sma">
<div class="a1">正常显示层</div>
<div class="a2">上下切换显示层</div>
</div>
</div>
</li>
<li>
<div class="a1">正常显示层</div>
<div class="bigBox">从ul的中间上下拉开显示层</div>
</li>
</ul>
</body>
</html>