css + javascript 实现滚动词云效果

// 163css.js
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 b = 0;
    var a = null;
    oDiv = document.getElementById("div1");
    aA = oDiv.getElementsByTagName("a");
    for (b = 0; b < aA.length; b++) {
        a = {};
        a.offsetWidth = aA[b].offsetWidth;
        a.offsetHeight = aA[b].offsetHeight;
        mcList.push(a)
    }
    sineCosine(0, 0, 0);
    positionAll();
    oDiv.onmouseover = function() {
        active = true
    }
    ;
    oDiv.onmouseout = function() {
        active = false
    }
    ;
    oDiv.onmousemove = function(e) {
        var c = window.event || e;
        mouseX = c.clientX - (oDiv.offsetLeft + oDiv.offsetWidth / 2);
        mouseY = c.clientY - (oDiv.offsetTop + oDiv.offsetHeight / 2);
        mouseX /= 5;
        mouseY /= 5
    }
    ;
    setInterval(update, 30)
}
;
function update() {
    var o;
    var n;
    if (active) {
        o = (-Math.min(Math.max(-mouseY, -size), size) / radius) * tspeed;
        n = (Math.min(Math.max(-mouseX, -size), size) / radius) * tspeed
    } else {
        o = lasta * 0.98;
        n = lastb * 0.98
    }
    lasta = o;
    lastb = n;
    if (Math.abs(o) <= 0.01 && Math.abs(n) <= 0.01) {
        return
    }
    var m = 0;
    sineCosine(o, n, m);
    for (var h = 0; h < mcList.length; h++) {
        var r = mcList[h].cx;
        var l = mcList[h].cy * ca + mcList[h].cz * (-sa);
        var g = mcList[h].cy * sa + mcList[h].cz * ca;
        var q = r * cb + g * sb;
        var k = l;
        var f = r * (-sb) + g * cb;
        var p = q * cc + k * (-sc);
        var i = q * sc + k * cc;
        var e = f;
        mcList[h].cx = p;
        mcList[h].cy = i;
        mcList[h].cz = e;
        per = d / (d + e);
        mcList[h].x = (howElliptical * p * per) - (howElliptical * 2);
        mcList[h].y = i * per;
        mcList[h].scale = per;
        mcList[h].alpha = per;
        mcList[h].alpha = (mcList[h].alpha - 0.6) * (10 / 6)
    }
    doPosition();
    depthSort()
}
function depthSort() {
    var a = 0;
    var b = [];
    for (a = 0; a < aA.length; a++) {
        b.push(aA[a])
    }
    b.sort(function(e, c) {
        if (e.cz > c.cz) {
            return -1
        } else {
            if (e.cz < c.cz) {
                return 1
            } else {
                return 0
            }
        }
    });
    for (a = 0; a < b.length; a++) {
        b[a].style.zIndex = a
    }
}
function positionAll() {
    var g = 0;
    var e = 0;
    var a = mcList.length;
    var c = 0;
    var f = [];
    var b = document.createDocumentFragment();
    for (c = 0; c < aA.length; c++) {
        f.push(aA[c])
    }
    f.sort(function() {
        return Math.random() < 0.5 ? 1 : -1
    });
    for (c = 0; c < f.length; c++) {
        b.appendChild(f[c])
    }
    oDiv.appendChild(b);
    for (var c = 1; c < a + 1; c++) {
        if (distr) {
            g = Math.acos(-1 + (2 * c - 1) / a);
            e = Math.sqrt(a * Math.PI) * g
        } else {
            g = Math.random() * (Math.PI);
            e = Math.random() * (2 * Math.PI)
        }
        mcList[c - 1].cx = radius * Math.cos(e) * Math.sin(g);
        mcList[c - 1].cy = radius * Math.sin(e) * Math.sin(g);
        mcList[c - 1].cz = radius * Math.cos(g);
        aA[c - 1].style.left = mcList[c - 1].cx + oDiv.offsetWidth / 2 - mcList[c - 1].offsetWidth / 2 + "px";
        aA[c - 1].style.top = mcList[c - 1].cy + oDiv.offsetHeight / 2 - mcList[c - 1].offsetHeight / 2 + "px"
    }
}
function doPosition() {
    var a = oDiv.offsetWidth / 2;
    var c = oDiv.offsetHeight / 2;
    for (var b = 0; b < mcList.length; b++) {
        aA[b].style.left = mcList[b].cx + a - mcList[b].offsetWidth / 2 + "px";
        aA[b].style.top = mcList[b].cy + c - mcList[b].offsetHeight / 2 + "px";
        aA[b].style.fontSize = Math.ceil(12 * mcList[b].scale / 2) + 8 + "px";
        aA[b].style.filter = "alpha(opacity=" + 100 * mcList[b].alpha + ")";
        aA[b].style.opacity = mcList[b].alpha
    }
}
function sineCosine(f, e, g) {
    sa = Math.sin(f * dtr);
    ca = Math.cos(f * dtr);
    sb = Math.sin(e * dtr);
    cb = Math.cos(e * dtr);
    sc = Math.sin(g * dtr);
    cc = Math.cos(g * dtr)
}
;

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