javascript实现动态标签云

#div1 {position:relative; width:350px; height:350px; border:1px solid #000; margin: 20px auto 0; }#div1 a {position:absolute; top:0px; left:0px; font-family: Microsoft YaHei; color:#000; font-weight:bold; text-decoration:none; padding: 3px 6px; }#div1 a:hover {border: 1px solid #eee; background: #FFF; }#div1 .blue {color:blue;}#div1 .red {color:red;}#div1 .green {color:green;}

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 $(document).ready(function() {  $("#div1").windstagball({      radius:120,      speed:10    });  });

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);}