网站背景吸附线条动画

先来看看最终效果：

源码奉上：（因为是整个网页都使用该背景，所以只需要引入JS就可以）

js代码：

 1 ! function() {
 2     function n(n, e, t) {
 3         return n.getAttribute(e) || t
 4     }
 5 
 6     function e(n) {
 7         return document.getElementsByTagName(n)
 8     }
 9 
10     function t() {
11         var t = e("script"),
12             o = t.length,
13             i = t[o - 1];
14         return {
15             l: o,
16             z: n(i, "zIndex", -1),
17             o: n(i, "opacity", .5),
18             c: n(i, "color", "0,0,0"),
19             n: n(i, "count", 99)
20         }
21     }
22 
23     function o() {
24         a = m.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, c = m.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
25     }
26 
27     function i() {
28         r.clearRect(0, 0, a, c);
29         var n, e, t, o, m, l;
30         s.forEach(function(i, x) {
31             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 += 1) {
32                 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()))
33             }
34         }), x(i)
35     }
36     var a, c, u, m = document.createElement("canvas"),
37         d = t(),
38         l = "c_n" + d.l,
39         r = m.getContext("2d"),
40         x = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function(n) {
41             window.setTimeout(n, 1e3 / 45)
42         },
43         w = Math.random,
44         y = {
45             x: null,
46             y: null,
47             max: 2e4
48         };
49     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) {
50         n = n || window.event, y.x = n.clientX, y.y = n.clientY
51     }, window.onmouseout = function() {
52         y.x = null, y.y = null
53     };
54     for(var s = [], f = 0; d.n > f; f += 1) {
55         var h = w() * a,
56             g = w() * c,
57             v = 2 * w() - 1,
58             p = 2 * w() - 1;
59         s.push({
60             x: h,
61             y: g,
62             xa: v,
63             ya: p,
64             max: 6e3
65         })
66     }
67     u = s.concat([y]), setTimeout(function() {
68         i()
69     }, 100)
70 }();

 引自：https://www.seoblogs.cn/seogj/2018620.html