本文实例讲述了JS模拟酷狗音乐播放器收缩折叠关闭效果代码。分享给大家供大家参考，具体如下：
这是一款模拟酷狗音乐播放器的关闭特效，采用JavaScript实现，关闭的时候播放界面缩成一条线，然后消失，就像有些电视机突然停电的效果，很有意思的网页动画特效。
运行效果截图如下：
在线演示地址如下：
http://demo.maopiaopiao.com/js/2015/js-kugou-music-player-style-demo/
具体代码如下：
<!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>酷狗音乐播放器的关闭特效，采用JavaScript实现</title>
<style type="text/css">
* {
padding:0px;
margin:0px;
}
#outer {
width:952px;
height: 640px;
position:absolute;
left:100px;
top:20px; }
#div1 {
width:952px;
height: 640px;
overflow:hidden;
position:absolute;font-size:0px;
}
#div1 a {
position:absolute;
width:23px;
height:21px;
right:5px;
top:5px;
display:block; z-index:100; background:url(images/kugou.jpg) no-repeat 957px 645px;}
#div1 a:hover {
background:url(images/hover.jpg) no-repeat right top;
}
#line {
height:3px;
width:952px;
display:none;
z-index:100;
position:absolute;
left:0px;
top:0px; font-size:0px;
}
#light{ /*width:50px; height:10px;*/ position:absolute; left:50%; top:50%;/* margin-left:-25px; margin-top:-5px;*/ width:0px; height:0px; filter:alpha(opacity:0);opacity:0;); overflow:hidden;}
</style>
<script type="text/javascript">
function css(obj, attr, value)
{
if(arguments.length==2)
{
if(attr!='opacity')
{
return parseInt(obj.currentStyle?obj.currentStyle[attr]:document.defaultView.getComputedStyle(obj, false)[attr]);
}
else
{
return Math.round(100*parseFloat(obj.currentStyle?obj.currentStyle[attr]:document.defaultView.getComputedStyle(obj, false)[attr]));
}
}
else if(arguments.length==3)
switch(attr)
{
case 'width':
case 'height':
case 'paddingLeft':
case 'paddingTop':
case 'paddingRight':
case 'paddingBottom':
value=Math.max(value,0);
case 'left':
case 'top':
case 'marginLeft':
case 'marginTop':
case 'marginRight':
case 'marginBottom':
obj.style[attr]=value+'px';
break;
case 'opacity':
obj.style.filter="alpha(opacity:"+value+")";
obj.style.opacity=value/100;
break;
default:
obj.style[attr]=value;
}
return function (attr_in, value_in){css(obj, attr_in, value_in)};
}
var MIAOV_MOVE_TYPE={
BUFFER: 1,
FLEX: 2
};//json
function miaovStopMove(obj)
{
clearInterval(obj.timer);
}
function miaovStartMove(obj, oTarget,iSpeedCtrol, iType, fnCallBack, fnDuring)
{
var fnMove=null;
if(obj.timer)
{
clearInterval(obj.timer);
}
switch(iType)
{
case MIAOV_MOVE_TYPE.BUFFER:
fnMove=miaovDoMoveBuffer;
break;
case MIAOV_MOVE_TYPE.FLEX:
fnMove=miaovDoMoveFlex;
break;
}
obj.timer=setInterval(function (){
fnMove(obj, oTarget,iSpeedCtrol, fnCallBack, fnDuring);
}, 30);
}
function miaovDoMoveBuffer(obj, oTarget,iSpeedCtrol, fnCallBack, fnDuring)
{
var bStop=true;
var attr='';
var speed=0;
var cur=0;
for(attr in oTarget)
{
cur=css(obj, attr);
if(oTarget[attr]!=cur)
{
bStop=false;
speed=(oTarget[attr]-cur)/iSpeedCtrol;
speed=speed>0?Math.ceil(speed):Math.floor(speed);
css(obj, attr, cur+speed);
}
}
if(fnDuring)fnDuring.call(obj);
if(bStop)
{
clearInterval(obj.timer);
obj.timer=null;
if(fnCallBack)fnCallBack.call(obj);
}
}
function miaovDoMoveFlex(obj, oTarget,iSpeedCtrol, fnCallBack, fnDuring)
{
var bStop=true;
var attr='';
var speed=0;
var cur=0;
for(attr in oTarget)
{
if(!obj.oSpeed)obj.oSpeed={};
if(!obj.oSpeed[attr])obj.oSpeed[attr]=0;
cur=css(obj, attr);
if(Math.abs(oTarget[attr]-cur)>=1 || Math.abs(obj.oSpeed[attr])>=1)
{
bStop=false;
obj.oSpeed[attr]+=(oTarget[attr]-cur)/iSpeedCtrol;
obj.oSpeed[attr]*=0.7;
css(obj, attr, cur+obj.oSpeed[attr]);
}
}
if(fnDuring)fnDuring.call(obj);
if(bStop)
{
clearInterval(obj.timer);
obj.timer=null;
if(fnCallBack)fnCallBack.call(obj);
}
}
</script>
<script type="text/javascript">
window.onload=function(){
var oDiv1 = document.getElementById('div1');
var oAbtn = oDiv1.getElementsByTagName('a')[0];
var oImg1 = document.getElementById('img1');
var oImg2 = document.getElementById('img2');
var oImg3 = document.getElementById('img3');
var oLine = document.getElementById('line');
var oLight = document.getElementById('light');
oAbtn.onclick=function(){
miaovStartMove(oDiv1, {height:3,marginTop:315},1.5, MIAOV_MOVE_TYPE.BUFFER,function(){
oImg1.style.display='none';
oLine.style.display='block';
miaovStartMove(oDiv1, {width:0,marginLeft:476},2, MIAOV_MOVE_TYPE.BUFFER);
miaovStartMove(oLine, {width:0},2, MIAOV_MOVE_TYPE.BUFFER);
miaovStartMove(oImg2, {width:0},2, MIAOV_MOVE_TYPE.BUFFER,function(){
miaovStartMove(oImg3, {width:200,height:10},1, MIAOV_MOVE_TYPE.BUFFER);
miaovStartMove(oLight, {width:200,height:10,marginLeft:-100,marginTop:-5,opacity:100},1, MIAOV_MOVE_TYPE.BUFFER,function(){
miaovStartMove(oLight, {opacity:0},1, MIAOV_MOVE_TYPE.BUFFER);
});
});
});
}
}
</script>
</head>
<body>
<div id="outer">
<div id="light"><img id="img3" src="images/line1.png" style="width:0px; height:0px;"/></div>
<div id="div1">
<img id="img1" src="images/kugou.jpg" style="height:640px; width:952px; z-index:-3;"/>
<a href="#"></a>
<div id="line">
<img id="img2" src="images/line.png" style=" width:952px; height:3px;" />
</div>
</div>
</div>
</body>
</html>
希望本文所述对大家JavaScript程序设计有所帮助。