纯JS实现旋转图片3D展示效果
CSS:
<styletype="text/css"> #show{position:relative;margin:20pxauto;width:800px;} .item{position:absolute;height:40px;width:60px;background:#999999;border:1pxsolid#eeeeee;cursor:pointer;}</style>
Html:
inputid="l"type="button"value="left"/><inputid="r"type="button"value="right"/> <divid="show"> <divclass="item">1</div> <divclass="item">2</div> <divclass="item">3</div> <divclass="item">4</div> <divclass="item">5</div> <divclass="item">6</div> <divclass="item">7</div> <divclass="item">8</div> <divclass="item">9</div> <divclass="item">0</div> <divclass="item">a</div> <divclass="item">b</div> <divclass="item">1</div> <divclass="item">2</div> <divclass="item">3</div> </div>
JS
<script> varlen; varshowerObj; varlistObj; varshowerWidth=800; varshowerHeight=400; varr; varcR=0; varccR=0; vartimer=0; window.onload=function(){ showerObj=document.getElementById("show"); listObj=showerObj.getElementsByTagName("div"); len=listObj.length; r=Math.PI/180*360/len; for(vari=0;i<len;i++){ varitem=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.onclick=function(){ cR=Math.PI/2-this.rotate; timer||(timer=setInterval(rotate,10)); } } varrX=showerObj.offsetLeft+showerWidth/2; varry=showerObj.offsetTop+showerHeight/2; varrotate=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(vari=0;i<len;i++){ varitem=listObj[i]; varw,h; varsinR=Math.sin(r*i+ccR); varcosR=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").onclick=function(){ cR=(cR+r+2*Math.PI)%(2*Math.PI); timer||(timer=setInterval(rotate,10)); } document.getElementById("r").onclick=function(){ cR=(cR-r+2*Math.PI)%(2*Math.PI); timer||(timer=setInterval(rotate,10)); } rotate(); } </script>
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