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  • 有趣的js(鼠标特效)

    <!DOCTYPE html>
    <html>
        <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
         <title>Document</title>
         </head>
     <body>
    
         <script type="text/javascript">
             !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", -1),
                        o: o(v, "opacity", 0.5),
                        c: o(v, "color", "0,0,0"),
                        n: o(v, "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>
      
     </body>
    </html>

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  • 原文地址:https://www.cnblogs.com/bunuo/p/9268423.html
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