js 标签云 | 标签云

以前只看到wordpress上面有个标签云的效果挺6，就好奇的弄个试试，还好网上有很多小伙伴的分享了，借鉴过来了哈哈

html代码

<!DOCTYPE html>

<html>

    <head>

        <meta charset="UTF-8">

        <title></title>

    </head>

    <style type="text/css">

        #div1 {position:relative; width:800px; height:800px; 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;}

    </style>

    <body>

        <div id="div1">

          <a href="#">标签云</a>

          <a href="#" class="red">PHP</a>

          <a href="#">瀑布流</a>

          <a href="#">Tab</a>

          <a href="#" class="blue">流体布局</a>

          <a href="#">SEO</a>

          <a href="#" class="red">彩蛋</a>

          <a href="#" class="green">IPhone</a>

        </div>

    </body>

    <script src="http://libs.baidu.com/jquery/2.0.0/jquery.min.js"></script>

    <script type="text/javascript" src="bqy.js"></script>

</html>

下面是js代码

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);

}

直接用就好了。。标签云大小的控制在js文件里，有个坐标变换，

 mcList[i-1].cx = radius * Math.cos(theta)*Math.sin(phi)*55;

 mcList[i-1].cy = radius * Math.sin(theta)*Math.sin(phi)*55;

 mcList[i-1].cz = radius * Math.cos(phi)*55;

在后面乘以想要放大缩小的系数就好了，默认居中的。。