js 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。。
