js 标签云效果

下载：http://files.cnblogs.com/zjfree/js_tag_list.rar

效果如下：

源码如下：

<html> 
<head> 
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> 
<title></title> 
<style type="text/css">
#div1 {position:relative; width:285px; height:280px; }
#div1 a {position:absolute; top:0px; left:0px; font-family: Microsoft YaHei; color:#cc0000; text-decoration:none; text-shadow:#999; font-weight:600}
#div1 a:hover {border: 1px solid #eee; background:#fff000; padding:3px;}
body {
    margin-left: 0px;
    margin-top: 0px;
    margin-right: 0px;
    margin-bottom: 0px;
}
</style>
<script type="text/javascript" >
var radius = 125;
var dtr = Math.PI/500;
var d=200;

var mcList = [];
var active = false;
var lasta = 1;
var lastb = 1;
var distr = true;
var tspeed=40;
var size=200;

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={};
        
        aA[i].style.color = '#'+('00000'+(Math.random()*0x1000000<<0).toString(16)).slice(-6);;
        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);
}
 
</script> 
 

</head> 
 
<body> 
<div id="div1"> 
<a href="#" target="_blank" style="color:">中国</a>
<a href="#" target="_blank" style="color:">消费者</a>
<a href="#" target="_blank" style="color:">消费</a>
<a href="#" target="_blank" style="color:">北京</a>
<a href="#" target="_blank" style="color:">奶粉</a>
<a href="#" target="_blank" style="color:">世界杯</a>
<a href="#" target="_blank" style="color:">品牌</a>
<a href="#" target="_blank" style="color:">食品安全</a>
<a href="#" target="_blank" style="color:">市场</a>
<a href="#" target="_blank" style="color:">上海</a>
<a href="#" target="_blank" style="color:">奇瑞</a>
<a href="#" target="_blank" style="color:">重工</a>
<a href="#" target="_blank" style="color:">珠宝</a>
<a href="#" target="_blank" style="color:">时代</a>
<a href="#" target="_blank" style="color:">广州</a>
<a href="#" target="_blank" style="color:">食品</a>
<a href="#" target="_blank" style="color:">企业</a>
<a href="#" target="_blank" style="color:">产品</a>
<a href="#" target="_blank" style="color:">专家</a>
<a href="#" target="_blank" style="color:">互联网</a>
<a href="#" target="_blank" style="color:">工商局</a>
<a href="#" target="_blank" style="color:">问题</a>
<a href="#" target="_blank" style="color:">活动</a>
<a href="#" target="_blank" style="color:">营销</a>
<a href="#" target="_blank" style="color:">福喜</a>
<a href="#" target="_blank" style="color:">总局</a>
<a href="#" target="_blank" style="color:">手机</a>
<a href="#" target="_blank" style="color:">公益</a>
<a href="#" target="_blank" style="color:">体验</a>
<a href="#" target="_blank" style="color:">宝贝</a>
<a href="#" target="_blank" style="color:">质量</a>
<a href="#" target="_blank" style="color:">文化</a>
<a href="#" target="_blank" style="color:">工商</a>
<a href="#" target="_blank" style="color:">进口</a>
<a href="#" target="_blank" style="color:">汽车</a>
<a href="#" target="_blank" style="color:">夏日</a>
<a href="#" target="_blank" style="color:">服务</a>
<a href="#" target="_blank" style="color:">移动</a>
<a href="#" target="_blank" style="color:">深圳</a>
<a href="#" target="_blank" style="color:">宝宝</a>
<a href="#" target="_blank" style="color:">合生</a>
<a href="#" target="_blank" style="color:">纸尿裤</a>
<a href="#" target="_blank" style="color:">美食</a>
<a href="#" target="_blank" style="color:">山西</a>
<a href="#" target="_blank" style="color:">行业</a>
<a href="#" target="_blank" style="color:">国际</a>
<a href="#" target="_blank" style="color:">时尚</a>
<a href="#" target="_blank" style="color:">价格</a>
<a href="#" target="_blank" style="color:">升级</a>
<a href="#" target="_blank" style="color:">消法</a>
</div> 
</body> 
</html>
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原文地址：https://www.cnblogs.com/zjfree/p/3880829.html