标签云，纯js代码实现！
一、效果图
二、代码
<html><head><style type="text/css">#div_tag {position:relative; height:540px; border: 1px solid #0097d3;}#div_tag a {position:absolute;top:0px;left:0px;font-family: Microsoft YaHei;color:#444;font-weight:bold;text-decoration:none;padding: 4px 8px;}#div_tag a:hover {border: 1px solid #0097d3; background: #b4b4b4; }</style></head><body><div id="div_tag"></div></body></html><script>// 生成随机颜色function getRandomColor() {var colorRandom = ['00', '33', '66', '99', 'CC', 'FF'];var color = colorRandom[Math.floor(Math.random() * 5)] + colorRandom[Math.floor(Math.random() * 5)] + colorRandom[Math.floor(Math.random() * 5)];return '#' + color;}randomTags();// 生成随机标签function randomTags() {var div_tag = document.getElementById('div_tag');var html_tag = '';for (var i = 0; i < 100; i++) {html_tag += '<a href="#" title="#" style="color:' + getRandomColor() + '">标签' + i + '</a>';}div_tag.innerHTML = html_tag;}var radius = 240;// 标签云半径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;//关键，这句是调试标签运动速度的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('div_tag');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>
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