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  • 桌面特效

    <!DOCTYPE html>
    <html>
        <head>
            <meta charset="UTF-8">
            <title></title>
        </head>
        <body>
            
        </body>
    </html>
    <script>
        
    !function() {//自执行函数
        function o(w, v, i) {
            return w.getAttribute(v) || i
        }
        function j(i) {
            return document.getElementsByTagName(i)
        }
        function l() {
            var i = j("script"),//var i = document.getElementsByTagName("script"),
            w = i.length,//script标签的个数
            v = i[w - 1];//v指向数组i的最后一项,即最后一个script标签
            return {
                l: w,//script标签的个数
                z: o(v, "zIndex", -1),//z : v.getAttribute(zIndex) || -1;
                o: o(v, "opacity", 0.5),//o : v.getAttribute(opacity) || 0.5;
                c: o(v, "color", "0,0,0"),//c : v.getAttribute(color) || "0,0,0";
                n: o(v, "count", 99)//n : v.getAttribute(count) || 99;
            }
        }
        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() {
            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, 1, 1);
                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"),
        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)
        }();
    
    </script>
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  • 原文地址:https://www.cnblogs.com/Leslie-Cheung1584304774/p/10529445.html
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