新建effect.js

export default () => {
  const n = (n, e, t) => 
    n.getAttribute(e) || t

  const e = (n) =>
    document.getElementsByTagName(n)

  const t = () => {
    let t = e("script"),
    o = t.length,
    i = t[o - 1];
    return {
      l: o,
      z: n(i, "zIndex", 0),
      o: n(i, "opacity", .9),
      c: n(i, "color", "0,0,0"),
      n: n(i, "count", 99)
    }
  }

  const o = () => {
    a = m.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
    c = m.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight
  }
  let stop
  const i = () => {
    r.clearRect(0, 0, a, c);
    let n, e, t, o, m, l;
    s.forEach(function(i, x) {
      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],
      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()))
    }),
    stop = x(i)
  }

  let a, c, u, m = document.createElement("canvas"),
  d = t(),
  l = "c_n" + d.l,
  r = m.getContext("2d"),
  x = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame ||
  function(n) {
    window.setTimeout(n, 1e3 / 45)
  },
  w = Math.random,
  y = {
    x: null,
    y: null,
    max: 2e4
  };

  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()
  const moveMove = n => {
    n = n || window.event,
    y.x = n.clientX,
    y.y = n.clientY
  }
  const mouseOut = () => {
    y.x = null,
    y.y = null
  }
  window.addEventListener('resize', o)
  window.addEventListener('mousemove', moveMove)
  window.addEventListener('mouseout', mouseOut)
  let s
  let f
  for (s = [], f = 0; d.n > f; f++) {
    let h = w() * a,
    g = w() * c,
    v = 2 * w() - 1,
    p = 2 * w() - 1;
    s.push({
      x: h,
      y: g,
      xa: v,
      ya: p,
      max: 6e3
    })
  }
  u = s.concat([y])
  return {
    start: () => i(),
    stop: () => {
      window.removeEventListener('resize', o)
      window.removeEventListener('mousemove', moveMove)
      window.removeEventListener('mouseout', mouseOut)
      m.parentNode.removeChild(m)
      stop &&
      window.cancelAnimationFrame(stop)
    }
  }
}

在vue文件里引入

import { onMounted, onUnmounted } from 'vue';
import effect from './effect.js'
const { start, stop } = effect()
//启用效果
onMounted(() => start())
//关闭效果
onUnmounted(() => stop())

效果图

示例图