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JavaScript实现的圆形浮动标签云效果实例

2019-11-20 11:54:36
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本文实例讲述了JavaScript实现的圆形浮动标签云效果。分享给大家供大家参考。具体如下:

这里介绍的JS标签云效果,在鼠标的作用下会自动转动,整体上围绕成一个圆形,各个标签之间无需Div代码,直接文字+链接的形式,有多少就显示多少,JavaScript会自动调整显示数量,让视觉效果最佳。

运行效果如下图所示:

具体代码如下:

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>js关键字球状旋转效果</title><style>body{background:#09c;}#div1{height:400px;width:450px; position:relative; margin:10px auto;}#div1 a{position:absolute;top:0px;left:0px;color:#fff;font-weight:bold;padding:3px 6px;}#div1 a:hover{border:1px solid #eee;background:#000;border-radius:5px;}</style><script type="text/javascript">var radius = 150;var dtr = Math.PI/180;var d=300;var mcList = [];var active = false;var lasta = 1;var lastb = 1;var distr = true;var tspeed=2;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);}</script></head><body><!-- 代码开始 --> <div id="div1"><a href="#" target="_blank">起名取名</a><a href="#" target="_blank">宣传策划</a><a href="#" target="_blank">网游试玩</a><a href="#" target="_blank">短信表白</a><a href="#" target="_blank">外语翻译</a><a href="#" target="_blank">产品推广</a><a href="#" target="_blank">网络营销</a><a href="#" target="_blank">动漫设计</a><a href="#" target="_blank">招聘求职</a><a href="#" target="_blank">家居装修</a><a href="#" target="_blank">影视创作</a><a href="#" target="_blank">照片美化</a><a href="#" target="_blank">产品设计</a><a href="#" target="_blank">包装设计</a><a href="#" target="_blank">Logo设计</a><a href="#" target="_blank">海报设计</a><a href="#" target="_blank">程序开发</a><a href="#" target="_blank">网站开发</a><a href="#" target="_blank">配音配词</a><a href="#" target="_blank">产品推广</a><a href="#" target="_blank">网络营销</a><a href="#" target="_blank">动漫设计</a><a href="#" target="_blank">家居装修</a><a href="#" target="_blank">影视创作</a><a href="#" target="_blank">照片美化</a></div><!-- 代码结束 --><div style="text-align:center;clear:both"><p>适用浏览器:IE8、360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗. </p></div></body></html>

希望本文所述对大家的javascript程序设计有所帮助。

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