纯JS实现旋转图片3D展示效果

CSS:
<style type="text/css"> #show{position:relative;margin:20px auto;width:800px;} .item{position:absolute;height:40px;width:60px;background:#999999;border:1px solid #eeeeee;cursor:pointer;}</style>

Html:
input id="l" type="button" value="left" /> <input id="r" type="button" value="right" /> <div id="show"> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> <div class="item">4</div> <div class="item">5</div> <div class="item">6</div> <div class="item">7</div> <div class="item">8</div> <div class="item">9</div> <div class="item">0</div> <div class="item">a</div> <div class="item">b</div> <div class="item">1</div> <div class="item">2</div> <div class="item">3</div> </div>

JS
<script> var len; var showerObj; var listObj; var showerWidth=800; var showerHeight=400; var r; var cR=0; var ccR=0; var timer=0; window. showerObj=document.getElementById("show"); listObj=showerObj.getElementsByTagName("div"); len=listObj.length; r=Math.PI/180*360/len; for(var i=0;i<len;i++){ var item=listObj[i]; item.style.top=showerHeight/2+Math.sin(r*i)*showerWidth/2-20+"px"; item.style.left=showerWidth/2+Math.cos(r*i)*showerWidth/2-30+"px"; item.rotate=(r*i+2*Math.PI)%(2*Math.PI); item. cR=Math.PI/2-this.rotate; timer || (timer=setInterval(rotate,10)); } } var rX=showerObj.offsetLeft+showerWidth/2; var ry=showerObj.offsetTop+showerHeight/2; var rotate=function(){ ccR=(ccR+2*Math.PI)%(2*Math.PI); if(cR-ccR<0) cR=cR+2*Math.PI; if(cR-ccR<Math.PI){ ccR=ccR+(cR-ccR)/19; }else{ ccR=ccR-(2*Math.PI+ccR-cR)/19; } if(Math.abs((cR+2*Math.PI)%(2*Math.PI)-(ccR+2*Math.PI)%(2*Math.PI))<Math.PI/720){ ccR=cR; clearInterval(timer); timer=0; } for(var i=0;i<len;i++){ var item=listObj[i]; var w,h; var sinR=Math.sin(r*i+ccR); var cosR=Math.cos(r*i+ccR); w=60+0.6*60*sinR; h=(40+0.6*40*sinR); item.style.cssText +=";width:"+w+"px;height:"+h+"px;top:"+parseInt(showerHeight/2+sinR*showerWidth/2/3-w/2)+"px;left:"+parseInt(showerWidth/2+cosR*showerWidth/2-h/2)+"px;z-index:"+parseInt(showerHeight/2+sinR*showerWidth/2/3-w/2)+";"; } } document.getElementById("l"). cR=(cR+r+2*Math.PI)%(2*Math.PI); timer || (timer=setInterval(rotate,10)); } document.getElementById("r"). cR=(cR-r+2*Math.PI)%(2*Math.PI); timer || (timer=setInterval(rotate,10)); } rotate(); } </script>
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