基于canvas封装一个鼠标移动动态化精美首页

案例效果：

使用方法：直接在需要添加动态背景的页面引入封装的min.js文件，比如import '../assets/js/canvas-nest.min';

封装好的canvas-nest.min文件可以直接引入使用

// JavaScript Document
!(function() {
    function o(w, v, i) {
        return w.getAttribute(v) || i;
    }

    function j(i) {
        return document.getElementsByTagName(i);
    }

    function l() {
        var i = j("script"),
            w = i.length,
            v = i[w - 1];
        return {
            l: w,
            z: o(v, "zIndex", 8),
            o: o(v, "opacity", 0.8),
            c: o(v, "color", "255,255,255"),
            n: o(v, "count", 240)
        };
    }

    function k() {
        (r = u.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth),
            (n = u.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight);
    }

    function b() {
        delay = delay + 1;
        if (delay < 5) {
            m(b);
        } else {
            delay = 0;
            e.clearRect(0, 0, r, n);
            var w = [f].concat(t);
            var x, v, A, B, z, y;
            t.forEach(function(i) {
                (i.x += i.xa),
                    (i.y += i.ya),
                    (i.xa *= i.x > r || i.x < 0 ? -1 : 1),
                    (i.ya *= i.y > n || i.y < 0 ? -1 : 1),
                    e.fillRect(i.x - 0.5, i.y - 0.5, 2, 2);
                e.fillStyle = "#FFFFFF";
                for (v = 0; v < w.length; v++) {
                    x = w[v];
                    if (i !== x && null !== x.x && null !== x.y) {
                        (B = i.x - x.x), (z = i.y - x.y), (y = B * B + z * z);
                        y < x.max &&
                            (x === f && y >= x.max / 2 && ((i.x -= 0.03 * B), (i.y -= 0.03 * z)),
                            (A = (x.max - y) / x.max),
                            e.beginPath(),
                            (e.lineWidth = A / 2),
                            (e.strokeStyle = "rgba(" + s.c + "," + (A + 0.2) + ")"),
                            e.moveTo(i.x, i.y),
                            e.lineTo(x.x, x.y),
                            e.stroke());
                    }
                }
                w.splice(w.indexOf(i), 1);
            }),
                m(b);
        }
    }
    var u = document.createElement("canvas"),
        s = l(),
        c = "c_n" + s.l,
        e = u.getContext("2d"),
        delay = 0,
        r,
        n,
        m =
            window.requestAnimationFrame ||
            window.webkitRequestAnimationFrame ||
            window.mozRequestAnimationFrame ||
            window.oRequestAnimationFrame ||
            window.msRequestAnimationFrame ||
            function(i) {
                window.setTimeout(i, 1000 / 45);
            },
        a = Math.random,
        f = {
            x: null,
            y: null,
            max: 20000
        };
    u.id = c;
    u.style.cssText = "position:fixed;top:0;left:0;z-index:" + s.z + ";opacity:" + s.o;
    j("body")[0].appendChild(u);
    k(), (window.onresize = k);
    (window.onmousemove = function(i) {
        (i = i || window.event), (f.x = i.clientX), (f.y = i.clientY);
    }),
        (window.onmouseout = function() {
            (f.x = null), (f.y = null);
        });
    for (var t = [], p = 0; s.n > p; p++) {
        var h = a() * r,
            g = a() * n,
            q = 2 * a() - 1,
            d = 2 * a() - 1;
        t.push({
            x: h,
            y: g,
            xa: q,
            ya: d,
            max: 6000
        });
    }
    setTimeout(function() {
        b();
    }, 100);
})();