先上一张效果图。
代码如下：
<script type="text/javascript" src="https://cdn.bootcss.com/canvas-nest.js/1.0.1/canvas-nest.min.js"></script>
1 /** 2 * Copyright (c) 2016 hustcc 3 * License: MIT 4 * Version: v1.0.1 5 * GitHub: https://github.com/hustcc/canvas-nest.js 6 **/ 7 ! 8 function() { 9 function n(n, e, t) { 10 return n.getAttribute(e) || t 11 } 12 function e(n) { 13 return document.getElementsByTagName(n) 14 } 15 function t() { 16 var t = e("script"), 17 o = t.length, 18 i = t[o - 1]; 19 return { 20 l: o, 21 z: n(i, "zIndex", -1), 22 o: n(i, "opacity", .5), 23 c: n(i, "color", "0,0,0"), 24 n: n(i, "count", 99) 25 } 26 } 27 function o() { 28 a = m.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth, 29 c = m.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight 30 } 31 function i() { 32 r.clearRect(0, 0, a, c); 33 var n, e, t, o, m, l; 34 s.forEach(function(i, x) { 35 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], 36 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())) 37 }), 38 x(i) 39 } 40 var a, c, u, m = document.createElement("canvas"), 41 d = t(), 42 l = "c_n" + d.l, 43 r = m.getContext("2d"), 44 x = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || 45 function(n) { 46 window.setTimeout(n, 1e3 / 45) 47 }, 48 w = Math.random, 49 y = { 50 x: null, 51 y: null, 52 max: 2e4 53 }; 54 m.id = l, 55 m.style.cssText = "position:fixed;top:0;left:0;z-index:" + d.z + ";opacity:" + d.o, 56 e("body")[0].appendChild(m), 57 o(), 58 window.onresize = o, 59 window.onmousemove = function(n) { 60 n = n || window.event, 61 y.x = n.clientX, 62 y.y = n.clientY 63 }, 64 window.onmouseout = function() { 65 y.x = null, 66 y.y = null 67 }; 68 for (var s = [], f = 0; d.n > f; f++) { 69 var h = w() * a, 70 g = w() * c, 71 v = 2 * w() - 1, 72 p = 2 * w() - 1; 73 s.push({ 74 x: h, 75 y: g, 76 xa: v, 77 ya: p, 78 max: 6e3 79 }) 80 } 81 u = s.concat([y]), 82 setTimeout(function() { 83 i() 84 }, 85 100) 86 } ();
第一是直接引入方式，第二可以直接拷贝到JS文件里面。
作者的GitHub地址是https://github.com/hustcc/canvas-nest.js