Javascript melaksanakan kemahiran peta_javascript penukar fokus 3D

Saya membuat percubaan kecil untuk menggunakan penyeretan tetikus dengan CSS3 Tangkapan skrin adalah seperti berikut:

Rakan-rakan yang biasa dengan kesan seretan harus biasa dengan kaedah seret ke kiri dan kanan selepas menahan tetikus.
Apa yang cuba demo kecil ini ialah menggunakan mata pengetahuan yang berkaitan dalam CSS3 pada paparan imej,
Apabila menyeret gambar, ia akan menunjukkan perasaan tiga dimensi~~

Kod langsung adalah seperti berikut:

#list{ width:400px; height:440px; margin:30px auto 30px; position:relative;z-index:500;}
#list li{height:40px;width:400px; position:relative;cursor:pointer;-webkit-perspective:800px; }
#list li div{height:40px;width:400px; -webkit-transform-style:preserve-3d;-webkit-backface-visibility:hidden;position:relative;-webkit-transform:translateZ(-200px);-webkit-transform:50ms all linear;}
#list span{height:40px; width:400px; position:absolute;left:0;top:0; overflow:hidden;}
#list div span:nth-child(1){background:url(img/1.jpg) no-repeat; -webkit-transform:translateZ(200px);}
#list div span:nth-child(2){background:url(img/2.jpg) no-repeat;-webkit-transform-origin:right;-webkit-transform:translateZ(200px) rotateY(-90deg);
}
#list div span:nth-child(3){background:url(img/3.jpg) no-repeat;-webkit-transform-origin:right;-webkit-transform:translateZ(-200px);
}
#list div span:nth-child(4){background:url(img/4.jpg) no-repeat;-webkit-transform-origin:left;-webkit-transform:translateZ(200px) rotateY(90deg);
}
#list em{ width:400px;height:400px; position:absolute;left:0;background:#666;}
#list li em:nth-of-type(1){-webkit-transform-origin:top;-webkit-transform:translateZ(200px) rotateX(-90deg); top:0;}
#list li em:nth-of-type(2){-webkit-transform-origin:bottom;-webkit-transform:translateZ(200px) rotateX(90deg); bottom:0;}
#list li:nth-last-child(1){ z-index:10;}
#list li:nth-last-child(2){ z-index:20;}
#list li:nth-last-child(3){ z-index:30;}
#list li:nth-last-child(4){ z-index:40;}
#list li:nth-last-child(5){ z-index:50;}
#list li:nth-last-child(6){ z-index:60;}
#list li:nth-child(2) span{ background-position:0 -40px;}
#list li:nth-child(3) span{ background-position:0 -80px;}
#list li:nth-child(4) span{ background-position:0 -120px;}
#list li:nth-child(5) span{ background-position:0 -160px;}
#list li:nth-child(6) span{ background-position:0 -200px;}
#list li:nth-child(7) span{ background-position:0 -240px;}
#list li:nth-child(8) span{ background-position:0 -280px;}
#list li:nth-child(9) span{ background-position:0 -320px;}
#list li:nth-child(10) span{ background-position:0 -360px;}
#list li:nth-child(11) span{ background-position:0 -400px;}
#btns{ width:130px; margin:0 auto;}
#btns li{ width:20px;height:20px;background:#fff; font-size:14px; font-weight:bold; text-align:center; line-height:20px; float:left; color:#f60; margin:0 3px; cursor:pointer;}
#btns .active{ background:#f60;color:#fff;}

HTML

<ul id="list">
 <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
  <li>
   <div>
      <span></span>
      <span></span>
      <span></span>
      <span></span>
      <em></em>
      <em></em>
    </div>
  </li>
</ul>
<ol id="btns">
 <li class="active">1</li>
  <li>2</li>
  <li>3</li>
  <li>4</li>
</ol>

JAVASCRIPT

var oList=document.getElementById("list");
var oBtns=document.getElementById("btns");
tabPic(oList,oBtns);
function tabPic(obj,btns)
{
 var aLi=obj.getElementsByTagName("li");
 var aBtn=btns.getElementsByTagName("li");
 var oUl=document.getElementsByTagName('ul')[0];
 var iDis=aLi[0].offsetWidth;
 var iDeg=90;
 aBtn.iNow=0;
 for(var i=0;i<aBtn.length;i++)
 {
 oUl.title=aBtn[i].title='妙味课堂-www.miaov.com';
 aBtn[i].index=i;
 aBtn[i].onclick=function()
 {
  for(var i=0;i<aLi.length;i++)
  {
  starMove(aLi[i],-this.index*iDeg,aBtn);
  }
 };
 }
 for(var i=0;i<aLi.length;i++)
 { 
 aLi[i].index=i;
 aLi[i].iDeg=0;
 aLi[i].off=false;
 aLi[i].onmousedown=function(ev)
 {
  if(this.off)
  {
  return;
  }
  var ev=event||ev;
  var iNowX=ev.clientX;
  var iNowDeg=0;
  var oThis=this;
  var iLength=0;
  var iMin=0;
  var iMax=0;
  document.onmousemove=function(ev)
  {
  if(Math.abs(iNowDeg)>=80)
  {
   return;
  }
  var ev=event||ev;
  iNowDeg+=(ev.clientX-iNowX)/iDis*(iDeg-30);
  iLength=Math.abs(parseInt(iNowDeg/9));
  iMin=oThis.index-iLength>0&#63;oThis.index-iLength:0;
  iMax=oThis.index+iLength<aLi.length&#63;oThis.index+iLength:aLi.length-1; 
  for(var i=iMin;i<=iMax;i++)
  {
   aLi[i].iDeg+=(ev.clientX-iNowX)/iDis*(iDeg-30);
   setDeg(aLi[i]);
  }
  iNowX=ev.clientX;  
  }
  document.onmouseup=function()
  {
  var iEnd=0;
  document.onmouseup=document.onmousemove=null;
  if( Math.abs(iNowDeg)>iDeg/4)
  {
   iEnd=iNowDeg>0&#63;90-iNowDeg:-(90-Math.abs(iNowDeg));
  }
  else
  {
   iEnd=-iNowDeg;
  }  
  iEnd=Math.round(iEnd+oThis.iDeg);
  for(var i=0;i<aLi.length;i++)
  {
   starMove(aLi[i],iEnd,aBtn);
  }
  }
  return false;
 };
 }
}
function starMove(obj,iTarget,aBtn)
{
 if(obj.timer)
 {
 clearInterval(obj.timer);
 }
 obj.off=true;
 var iSpeed=0;
 var iNow= iTarget>=0&#63; Math.abs((aBtn.length-iTarget/90)%aBtn.length): Math.abs((iTarget/90) % aBtn.length);
 if(iNow!=aBtn.iNow)
 {
 aBtn[aBtn.iNow].className="";
 aBtn.iNow=iNow;
 aBtn[aBtn.iNow].className="active";
 }
 obj.timer=setInterval(
 function()
 {
  iSpeed+=(iTarget-obj.iDeg)/12;
  iSpeed*=0.86;
  if(Math.abs(obj.iDeg-iTarget)<0.5 && Math.abs(iSpeed)<0.5)
  {
  clearInterval(obj.timer);
  obj.iDeg=iTarget;
  obj.off=false;
  }
  else
  { 
  obj.iDeg+=iSpeed;
  }
  setDeg(obj);
 },24
 );
}
function setDeg(obj)
{
 var oDiv=obj.children[0];
 with(oDiv.style)
 {
 WebkitTransform="translateZ(-200px) rotateY("+obj.iDeg+"deg)";
 }
}

Kesan ini hanyalah percubaan Jika anda memerlukannya, anda boleh tinggalkan mesej di bawah dan hantar terus kod sumber.