一个很有趣3D球状标签云兼容IE8

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body {background: #000 url(index.png) no-repeat center 230px;}#div1 {position:relative; width:450px; height:450px; margin: 20px auto 0; }#div1 a {position:absolute; top:0px; left:0px; font-family: Microsoft YaHei; color:#fff; font-weight:bold; text-decoration:none; padding: 3px 6px; }#div1 a:hover {border: 1px solid #eee; background: #000; }#div1 .blue {color:blue;}#div1 .red {color:red;}#div1 .yellow {color:yellow;}

var radius = 120;var dtr = Math.PI/180;var d=300;var mcList = [];var active = false;var lasta = 1;var lastb = 1;var distr = true;var tspeed=10;var size=250;var mouseX=0;var mouseY=0;var howElliptical=1;var aA=null;var oDiv=null;window.onload=function (){var i=0;var oTag=null;oDiv=document.getElementById('div1');aA=oDiv.getElementsByTagName('a');for(i=0;i<aA.length;i++){oTag={};oTag.offsetWidth=aA[i].offsetWidth;oTag.offsetHeight=aA[i].offsetHeight;mcList.push(oTag);}sineCosine( 0,0,0 );positionAll();oDiv.onmouseover=function (){active=true;};oDiv.onmouseout=function (){active=false;};oDiv.onmousemove=function (ev){var oEvent=window.event || ev;mouseX=oEvent.clientX-(oDiv.offsetLeft+oDiv.offsetWidth/2);mouseY=oEvent.clientY-(oDiv.offsetTop+oDiv.offsetHeight/2);mouseX/=5;mouseY/=5;};setInterval(update, 30);};function update(){var a;var b;if(active){a = (-Math.min( Math.max( -mouseY, -size ), size ) / radius ) * tspeed;b = (Math.min( Math.max( -mouseX, -size ), size ) / radius ) * tspeed;}else{a = lasta * 0.98;b = lastb * 0.98;}lasta=a;lastb=b;if(Math.abs(a)<=0.01 && Math.abs(b)<=0.01){return;}var c=0;sineCosine(a,b,c);for(var j=0;j<mcList.length;j++){var rx1=mcList[j].cx;var ry1=mcList[j].cy*ca+mcList[j].cz*(-sa);var rz1=mcList[j].cy*sa+mcList[j].cz*ca;var rx2=rx1*cb+rz1*sb;var ry2=ry1;var rz2=rx1*(-sb)+rz1*cb;var rx3=rx2*cc+ry2*(-sc);var ry3=rx2*sc+ry2*cc;var rz3=rz2;mcList[j].cx=rx3;mcList[j].cy=ry3;mcList[j].cz=rz3;per=d/(d+rz3);mcList[j].x=(howElliptical*rx3*per)-(howElliptical*2);mcList[j].y=ry3*per;mcList[j].scale=per;mcList[j].alpha=per;mcList[j].alpha=(mcList[j].alpha-0.6)*(10/6);}doPosition();depthSort();}function depthSort(){var i=0;var aTmp=[];for(i=0;i<aA.length;i++){aTmp.push(aA[i]);}aTmp.sort(function (vItem1, vItem2){if(vItem1.cz>vItem2.cz){return -1;}else if(vItem1.cz<vItem2.cz){return 1;}else{return 0;}});for(i=0;i<aTmp.length;i++){aTmp[i].style.zIndex=i;}}function positionAll(){var phi=0;var theta=0;var max=mcList.length;var i=0;var aTmp=[];var oFragment=document.createDocumentFragment();//随机排序for(i=0;i<aA.length;i++){aTmp.push(aA[i]);}aTmp.sort(function (){return Math.random()<0.5?1:-1;});for(i=0;i<aTmp.length;i++){oFragment.appendChild(aTmp[i]);}oDiv.appendChild(oFragment);for( var i=1; i<max+1; i++){if( distr ){phi = Math.acos(-1+(2*i-1)/max);theta = Math.sqrt(max*Math.PI)*phi;}else{phi = Math.random()*(Math.PI);theta = Math.random()*(2*Math.PI);}//坐标变换mcList[i-1].cx = radius * Math.cos(theta)*Math.sin(phi);mcList[i-1].cy = radius * Math.sin(theta)*Math.sin(phi);mcList[i-1].cz = radius * Math.cos(phi);aA[i-1].style.left=mcList[i-1].cx+oDiv.offsetWidth/2-mcList[i-1].offsetWidth/2+'px';aA[i-1].style.top=mcList[i-1].cy+oDiv.offsetHeight/2-mcList[i-1].offsetHeight/2+'px';}}function doPosition(){var l=oDiv.offsetWidth/2;var t=oDiv.offsetHeight/2;for(var i=0;i<mcList.length;i++){aA[i].style.left=mcList[i].cx+l-mcList[i].offsetWidth/2+'px';aA[i].style.top=mcList[i].cy+t-mcList[i].offsetHeight/2+'px';aA[i].style.fontSize=Math.ceil(12*mcList[i].scale/2)+8+'px';aA[i].style.filter="alpha(opacity="+100*mcList[i].alpha+")";aA[i].style.opacity=mcList[i].alpha;}}function sineCosine( a, b, c){sa = Math.sin(a * dtr);ca = Math.cos(a * dtr);sb = Math.sin(b * dtr);cb = Math.cos(b * dtr);sc = Math.sin(c * dtr);cc = Math.cos(c * dtr);}