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>版权声明：本文为博主原创文章，未经博主允许不得转载。
原文地址：http://blog.csdn.net/class_horse/article/details/46968493
