JS打开层/关闭层/移动层动画效果的实例代码

body, span, div, td { font-size:12px; line-height:1.5em; color:#849BCA; }
#bodyL { float:left; width:84px; margin-right:2px; }
a.od { width:80px; height:25px; line-height:25px; text-align:center; font-weight:bold; border: 2px solid #849BCA; display:block; color:#547BC9; float:left; text-decoration:none; margin-top:2px; }
a.od:link { background:#EEF1F8; }
a.od:visited { background:#EEF1F8; }
a.od:hover { background:#EEE; }
a.od:active { background:#EEE; }
#fd { width:500px; height:200px; background:#EDF1F8; border: 2px solid #849BCA; margin-top:2px; margin-left:2px; float:left; overflow:hidden; position:absolute; left:0px; top:0px; cursor:move; float:left;/*filter:alpha(opacity=50);*/ }
.content { padding:10px; }

<div id="bodyL">
<a href="#" class="od" onclick = "show('fd');return false;"> [打开层] </a>
<a href="#" class="od" onclick = "closeed('fd');return false;"> [关闭层] </a>
</div>
<div id="fd" style="display:none;filter:alpha(opacity=100);opacity:1;">
  <div class="content">移动层</div>
</div>

var prox;
var proy;
var proxc;
var proyc;
function show(id){/*--打开--*/
clearInterval(prox);
clearInterval(proy);
clearInterval(proxc);
clearInterval(proyc);
var o = document.getElementById(id);
o.style.display = "block";
o.style.width = "1px";
o.style.height = "1px";
prox = setInterval(function(){openx(o,500)},10);
}
function openx(o,x){/*--打开x--*/
var cx = parseInt(o.style.width);
if(cx < x)
{
o.style.width = (cx + Math.ceil((x-cx)/5)) +"px";
}
else
{
clearInterval(prox);
proy = setInterval(function(){openy(o,200)},10);
}
}
function openy(o,y){/*--打开y--*/
var cy = parseInt(o.style.height);
if(cy < y)
{
o.style.height = (cy + Math.ceil((y-cy)/5)) +"px";
}
else
{
clearInterval(proy);
}
}
function closeed(id){/*--关闭--*/
clearInterval(prox);
clearInterval(proy);
clearInterval(proxc);
clearInterval(proyc);
var o = document.getElementById(id);
if(o.style.display == "block")
{
proyc = setInterval(function(){closey(o)},10);
}
}
function closey(o){/*--打开y--*/
var cy = parseInt(o.style.height);
if(cy > 0)
{
o.style.height = (cy - Math.ceil(cy/5)) +"px";
}
else
{
clearInterval(proyc);
proxc = setInterval(function(){closex(o)},10);
}
}
function closex(o){/*--打开x--*/
var cx = parseInt(o.style.width);
if(cx > 0)
{
o.style.width = (cx - Math.ceil(cx/5)) +"px";
}
else
{
clearInterval(proxc);
o.style.display = "none";
}
}
/*-------------------------鼠标拖动---------------------*/
var od = document.getElementById("fd");
var dx,dy,mx,my,mouseD;
var odrag;
var isIE = document.all ? true : false;
document.onmousedown = function(e){
var e = e ? e : event;
if(e.button == (document.all ? 1 : 0))
{
mouseD = true;
}
}
document.onmouseup = function(){
mouseD = false;
odrag = "";
if(isIE)
{
od.releaseCapture();
od.filters.alpha.opacity = 100;
}
else
{
window.releaseEvents(od.MOUSEMOVE);
od.style.opacity = 1;
}
}
//function readyMove(e){
od.onmousedown = function(e){
odrag = this;
var e = e ? e : event;
if(e.button == (document.all ? 1 : 0))
{
mx = e.clientX;
my = e.clientY;
od.style.left = od.offsetLeft + "px";
od.style.top = od.offsetTop + "px";
if(isIE)
{
od.setCapture();
od.filters.alpha.opacity = 50;
}
else
{
window.captureEvents(Event.MOUSEMOVE);
od.style.opacity = 0.5;
}
//alert(mx);
//alert(my);
}
}
document.onmousemove = function(e){
var e = e ? e : event;
//alert(mrx);
//alert(e.button);
if(mouseD==true && odrag)
{
var mrx = e.clientX - mx;
var mry = e.clientY - my;
od.style.left = parseInt(od.style.left) +mrx + "px";
od.style.top = parseInt(od.style.top) + mry + "px";
mx = e.clientX;
my = e.clientY;
}
}