JS模拟酷狗音乐播放器收缩折叠关闭效果代码_javascript技巧

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);
 }
}