JS 鼠标粒子效果

<!--鼠标粒子特效-->
<script>
    !function() {
        function n(n, e, t) {
            return n.getAttribute(e) || t
        }
        function e(n) {
            return document.getElementsByTagName(n)
        }
        function t() {
            var t = e("script"),
            o = t.length,
            i = t[o - 1];
            return {
                l: o,
                z: n(i, "zIndex", -1),
                o: n(i, "opacity", .5),
                c: n(i, "color", "0,0,0"),
                n: n(i, "count", 99)
            }
        }
        function o() {
            a = m.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
            c = m.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
        }
        function i() {
            r.clearRect(0, 0, a, c);
            var n, e, t, o, m, l;
            s.forEach(function(i, x) {
                for (i.x += i.xa, i.y += i.ya, i.xa *= i.x > a || i.x < 0 ? -1 : 1, i.ya *= i.y > c || i.y < 0 ? -1 : 1, r.fillRect(i.x - .5, i.y - .5, 1, 1), e = x + 1; e < u.length; e++) n = u[e],
                null !== n.x && null !== n.y && (o = i.x - n.x, m = i.y - n.y,
                l = o * o + m * m, l < n.max && (n === y && l >= n.max / 2 && (i.x -= .03 * o, i.y -= .03 * m), t = (n.max - l) / n.max, r.beginPath(), r.lineWidth = t / 2, r.strokeStyle = "rgba(" + d.c + "," + (t + .2) + ")", r.moveTo(i.x, i.y), r.lineTo(n.x, n.y), r.stroke()))
            }),
            x(i)
        }
        var a, c, u, m = document.createElement("canvas"),
        d = t(),
        l = "c_n" + d.l,
        r = m.getContext("2d"),
        x = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
        function(n) {
            window.setTimeout(n, 1e3 / 45)
        },
        w = Math.random,
        y = {
            x: null,
            y: null,
            max: 2e4
        };
        m.id = l,
        m.style.cssText = "position:fixed;top:0;left:0;z-index:" + d.z + ";opacity:" + d.o,
        e("body")[0].appendChild(m),
        o(),
        window.onresize = o,
        window.onmousemove = function(n) {
            n = n || window.event,
            y.x = n.clientX,
            y.y = n.clientY
        },
        window.onmouseout = function() {
            y.x = null,
            y.y = null
        };
        for (var s = [], f = 0; d.n > f; f++) {
            var h = w() * a,
            g = w() * c,
            v = 2 * w() - 1,
            p = 2 * w() - 1;
            s.push({
                x: h,
                y: g,
                xa: v,
                ya: p,
                max: 6e3
            })
        }
        u = s.concat([y]),
        setTimeout(function() { i();  }, 100)
    } ();
</script>

效果如如下：