javascript实现动态标签云

发布时间:2018-12-05 12:25:30编辑:丝画阁阅读(501)

#div1{position:relative;width:350px;height:350px;border:1pxsolid#000;margin:20pxauto0; }
#div1a {position:absolute;top:0px;left:0px;font-family: Microsoft YaHei;color:#000;font-weight:bold;text-decoration:none;padding:3px6px; }
#div1a:hover {border:1pxsolid#eee;background:#FFF; }
#div1.blue{color:blue;}
#div1.red{color:red;}
#div1.green{color:green;}



<divid="div1">
  <ahref="#">标签云</a>
  <ahref="#"class="red">PHP</a>
  <ahref="#">瀑布流</a>
  <ahref="#">Tab</a>
  <ahref="#"class="blue">流体布局</a>
  <ahref="#">SEO</a>
  <ahref="#"class="red">彩蛋</a>
  <ahref="#"class="green">JavaScript</a>
  <ahref="#">miaov</a>
  <ahref="#"class="red">CSS</a>
  <ahref="#">asp.net</a>
  <ahref="#"class="blue">蓝色经典</a>
  <ahref="#">OOP</a>
  <ahref="#"class="red">Android</a>
  <ahref="#"class="blue">妙味茶馆</a>
  <ahref="#">dialog</a>
  <ahref="#"class="blue">淘客</a>
  <ahref="#">Pin</a>
  <ahref="#">微博</a>
  <ahref="#"class="green">IPhone</a>
</div>


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


首先得写好布局,最外层div样式position设置为relative

内层元素position为absolute,这样才能形成效果,top为0,left为0
先导入jquery文件,再导入相应的插件文件
获取$("#xxx")元素,并调用windstagball()函数,radius是标签球的变径大小,speed顾名思义就是运动的速度。

附上js插件

varradius = 120;
vardtr = Math.PI/180;
vard=300;
 
varmcList = [];
varactive =false;
varlasta = 1;
varlastb = 1;
vardistr =true;
vartspeed=10;
varsize=250;
 
varmouseX=0;
varmouseY=0;
 
varhowElliptical=1;
 
varaA=null;
varoDiv=null;
 
window.onload=function()
{
    vari=0;
    varoTag=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)
    {
        varoEvent=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);
};
 
functionupdate()
{
    vara;
    varb;
     
    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;
    }
     
    varc=0;
    sineCosine(a,b,c);
    for(varj=0;j<mcList.length;j++)
    {
        varrx1=mcList[j].cx;
        varry1=mcList[j].cy*ca+mcList[j].cz*(-sa);
        varrz1=mcList[j].cy*sa+mcList[j].cz*ca;
         
        varrx2=rx1*cb+rz1*sb;
        varry2=ry1;
        varrz2=rx1*(-sb)+rz1*cb;
         
        varrx3=rx2*cc+ry2*(-sc);
        varry3=rx2*sc+ry2*cc;
        varrz3=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();
}
 
functiondepthSort()
{
    vari=0;
    varaTmp=[];
     
    for(i=0;i<aA.length;i++)
    {
        aTmp.push(aA[i]);
    }
     
    aTmp.sort
    (
        function(vItem1, vItem2)
        {
            if(vItem1.cz>vItem2.cz)
            {
                return-1;
            }
            elseif(vItem1.cz<vItem2.cz)
            {
                return1;
            }
            else
            {
                return0;
            }
        }
    );
     
    for(i=0;i<aTmp.length;i++)
    {
        aTmp[i].style.zIndex=i;
    }
}
 
functionpositionAll()
{
    varphi=0;
    vartheta=0;
    varmax=mcList.length;
    vari=0;
     
    varaTmp=[];
    varoFragment=document.createDocumentFragment();
     
    //随机排序
    for(i=0;i<aA.length;i++)
    {
        aTmp.push(aA[i]);
    }
     
    aTmp.sort
    (
        function()
        {
            returnMath.random()<0.5?1:-1;
        }
    );
     
    for(i=0;i<aTmp.length;i++)
    {
        oFragment.appendChild(aTmp[i]);
    }
     
    oDiv.appendChild(oFragment);
     
    for(vari=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';
    }
}
 
functiondoPosition()
{
    varl=oDiv.offsetWidth/2;
    vart=oDiv.offsetHeight/2;
    for(vari=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;
    }
}
 
functionsineCosine( 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);
}

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