本文實例講述了JavaScript實現的圓形浮動標簽云效果。分享給大家供大家參考。具體如下：
這里介紹的JS標簽云效果，在鼠標的作用下會自動轉動，整體上圍繞成一個圓形，各個標簽之間無需Div代碼，直接文字+鏈接的形式，有多少就顯示多少，JavaScript會自動調整顯示數量，讓視覺效果最佳。
運行效果如下圖所示：
具體代碼如下：
<!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關鍵字球狀旋轉效果</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(); //隨機排序 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); } //坐標變換 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><!-- 代碼開始 --> <div id="div1"><a href="#" target="_blank">起名取名</a><a href="#" target="_blank">宣傳策劃</a><a href="#" target="_blank">網游試玩</a><a href="#" target="_blank">短信表白</a><a href="#" target="_blank">外語翻譯</a><a href="#" target="_blank">產品推廣</a><a href="#" target="_blank">網絡營銷</a><a href="#" target="_blank">動漫設計</a><a href="#" target="_blank">招聘求職</a><a href="#" target="_blank">家居裝修</a><a href="#" target="_blank">影視創作</a><a href="#" target="_blank">照片美化</a><a href="#" target="_blank">產品設計</a><a href="#" target="_blank">包裝設計</a><a href="#" target="_blank">Logo設計</a><a href="#" target="_blank">海報設計</a><a href="#" target="_blank">程序開發</a><a href="#" target="_blank">網站開發</a><a href="#" target="_blank">配音配詞</a><a href="#" target="_blank">產品推廣</a><a href="#" target="_blank">網絡營銷</a><a href="#" target="_blank">動漫設計</a><a href="#" target="_blank">家居裝修</a><a href="#" target="_blank">影視創作</a><a href="#" target="_blank">照片美化</a></div><!-- 代碼結束 --><div style="text-align:center;clear:both"><p>適用瀏覽器：IE8、360、FireFox、Chrome、Safari、Opera、傲游、搜狗、世界之窗. </p></div></body></html>希望本文所述對大家的javascript程序設計有所幫助。
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