博客园粒子效果

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一 html

二  引入js

!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", 1), c: n(i, "color", "82,183,186"), 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)

}();