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标签云效果当前运用比较广泛，当然形式也有很多种，比较常见的一种就是3D球形效果。
下面就分享一个这样的代码实例，需要的朋友可以做一下参考。
<!doctype html>
<html>
<head>
<meta charset="utf-8">
<title>3D球形标签</title>
<style type="text/css">
body {
background: #24313d;
}
#tagsList {
position: relative;
width: 450px;
height: 450px;
margin: 150px auto 0;
}
#tagsList a {
position: absolute;
top: 0px;
left: 0px;
font-family: Microsoft YaHei;
color: #fff;
font-weight: bold;
text-decoration: none;
padding: 3px 6px;
}
#tagsList a:hover {
color: #FF0000;
letter-spacing: 2px;
}
</style>
<script>
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('tagsList');
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>
<div id="tagsList">
<a href="#/Article.aspx?kid=1" title="星级评分">星级评分</a>
<a href="#/Article.aspx?kid=2" title="层特效">层特效</a>
<a href="#/Article.aspx?kid=3" title="关键字">关键字</a>
<a href="#/Article.aspx?kid=4" title="拖拽">拖拽</a>
<a href="#/Article.aspx?kid=5" title="分页插件">分页插件</a>
<a href="#/Article.aspx?kid=6" title="时间插件">时间插件</a>
<a href="#/Article.aspx?kid=7" title="弹出层">弹出层</a>
<a href="#/Article.aspx?kid=8" title="数据统计">数据统计</a>
<a href="#/Article.aspx?kid=9" title="HTML5">HTML5</a>
<a href="#/Article.aspx?kid=10" title="置顶特效">置顶特效</a>
<a href="#/Article.aspx?kid=11" title="选项卡">选项卡</a>
<a href="#/Article.aspx?kid=12" title="导航菜单">导航菜单</a>
<a href="#/Article.aspx?kid=13" title="原创">原创</a>
<a href="#/Article.aspx?kid=14" title="动画插件">动画插件</a>
<a href="#/Article.aspx?kid=15" title="实用特效">实用特效</a>
<a href="#/Article.aspx?kid=16" title="table插件">table插件</a>
<a href="#/Article.aspx?kid=17" title="文字特效">文字特效</a>
<a href="#/Article.aspx?kid=18" title="图片特效">图片特效</a>
<a href="#/Article.aspx?kid=19" title="在线客服">在线客服</a>
<a href="#/Article.aspx?kid=20" title="瀑布流">瀑布流</a>
<a href="#/Article.aspx?kid=21" title="蚂蚁部落">softwhy.com</a>
</div>
</body>
</html>
效果如下：
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