原生JS实现球面展示特效
分享一个由原生JS实现的球面展示效果，效果如下：
实现代码如下：
<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>原生JS实现球面展示特效</title>
<style>
body {
background-color: #000;
}
#div1 {
position: relative;
width: 450px;
height: 450px;
margin: 20px auto 0
}
#div1 a {
position: absolute;
top: 0px;
left: 0px;
font-family: Microsoft YaHei;
color: #fff;
font-weight: bold;
text-decoration: none;
padding: 3px 6px
}
#div1 a:hover {
border: 1px solid #eee;
background: #000
}
#div1 .blue {
color: blue
}
#div1 .red {
color: red
}
#div1 .yellow {
color: yellow
}
p {
font: 16px Microsoft YaHei;
text-align: center;
color: #ba0c0c
}
p a {
font-size: 14px;
color: #ba0c0c
}
p a:hover {
color: red
}
</style>
</head>
<body>
<div id="div1">
<a>JS课程</a>
<a class="red">教程</a>
<a>试听</a>
<a>精品</a>
<a class="blue">视频</a>
<a>SEO</a>
<a class="red">特效</a>
<a class="yellow">JavaScript</a>
<a>Baidu</a>
<a class="red">CSS</a>
<a>求职</a>
<a class="blue">书籍</a>
<a>继承</a>
<a class="red">课程</a>
<a class="blue">OOP</a>
<a>XHTML</a>
<a class="blue">setInterval</a>
<a>W3C</a>
<a>阿里</a>
<a class="yellow">代码</a>
<a>华为</a>
</div>
<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('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();
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);
}
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>
</body>
</html>本文参与 腾讯云自媒体同步曝光计划，分享自作者个人站点/博客。
原始发表：2019/07/28 ，如有侵权请联系 cloudcommunity@tencent.com 删除
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