地址：https://github.com/hustcc/canvas-nest.js
如果以上的js有问题，直接点击下面的下载！
canvas-nest.js下载地址：https://cdn.bootcss.com/canvas-nest.js/1.0.1/canvas-nest.js
color=”255,0,0” 背景粒子线的颜色值
opacity=”0.5” 背景粒子线的透明度，一般设置成0.5-1之间
count=”99” 背景粒子线的密度，建议不要太大，否则页面容易卡死
实现效果：
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title></title>
</head>
<body>
<p>今天学习canvas-nest.js</p>
<script color="0,0,0" opacity="0.5" count="99"
src="../js/canvas-nest.js"
type="text/javascript" charset="utf-8">
</script>
</body>
</html>
canvas-nest.js
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i=t(function(e,t){Object.defineProperty(t,"__esModule",{value:!0});t.SizeSensorId="size-sensor-id",t.SensorStyle="display:block;position:absolute;top:0;left:0;height:100%;width:100%;overflow:hidden;pointer-events:none;z-index:-1;opacity:0",t.SensorClassName="size-sensor-object"});e(i);i.SizeSensorId,i.SensorStyle,i.SensorClassName;var r=t(function(e,t){Object.defineProperty(t,"__esModule",{value:!0}),t.createSensor=void 0;var n,r=(n=o)&&n.__esModule?n:{default:n};t.createSensor=function(e){var t=void 0,n=[],o=(0,r.default)(function(){n.forEach(function(t){t(e)})}),a=function(){t&&t.parentNode&&(t.contentDocument.defaultView.removeEventListener("resize",o),t.parentNode.removeChild(t),t=void 0,n=[])};return{element:e,bind:function(r){t||(t=function(){"static"===getComputedStyle(e).position&&(e.style.position="relative");var t=document.createElement("object");return t.onload=function(){t.contentDocument.defaultView.addEventListener("resize",o),o()},t.setAttribute("style",i.SensorStyle),t.setAttribute("class",i.SensorClassName),t.type="text/html",e.appendChild(t),t.data="about:blank",t}()),-1===n.indexOf(r)&&n.push(r)},destroy:a,unbind:function(e){var o=n.indexOf(e);-1!==o&&n.splice(o,1),0===n.length&&t&&a()}}}});e(r);r.createSensor;var a=t(function(e,t){Object.defineProperty(t,"__esModule",{value:!0}),t.createSensor=void 0;var n,i=(n=o)&&n.__esModule?n:{default:n};t.createSensor=function(e){var t=void 0,n=[],o=(0,i.default)(function(){n.forEach(function(t){t(e)})}),r=function(){t.disconnect(),n=[],t=void 0};return{element:e,bind:function(i){t||(t=function(){var t=new ResizeObserver(o);return t.observe(e),o(),t}()),-1===n.indexOf(i)&&n.push(i)},destroy:r,unbind:function(e){var o=n.indexOf(e);-1!==o&&n.splice(o,1),0===n.length&&t&&r()}}}});e(a);a.createSensor;var s=t(function(e,t){Object.defineProperty(t,"__esModule",{value:!0}),t.createSensor=void 0;t.createSensor="undefined"!=typeof ResizeObserver?a.createSensor:r.createSensor});e(s);s.createSensor;var u=t(function(e,t){Object.defineProperty(t,"__esModule",{value:!0}),t.removeSensor=t.getSensor=void 0;var o,r=(o=n)&&o.__esModule?o:{default:o};var a={};t.getSensor=function(e){var t=e.getAttribute(i.SizeSensorId);if(t&&a[t])return a[t];var n=(0,r.default)();e.setAttribute(i.SizeSensorId,n);var o=(0,s.createSensor)(e);return a[n]=o,o},t.removeSensor=function(e){var t=e.element.getAttribute(i.SizeSensorId);e.element.removeAttribute(i.SizeSensorId),e.destroy(),t&&a[t]&&delete a[t]}});e(u);u.removeSensor,u.getSensor;var c=t(function(e,t){Object.defineProperty(t,"__esModule",{value:!0}),t.clear=t.bind=void 0;t.bind=function(e,t){var n=(0,u.getSensor)(e);return n.bind(t),function(){n.unbind(t)}},t.clear=function(e){var t=(0,u.getSensor)(e);(0,u.removeSensor)(t)}});e(c);var l=c.clear,d=c.bind,v=window.requestAnimationFrame||window.webkitRequestAnimationFrame||window.mozRequestAnimationFrame||window.msRequestAnimationFrame||window.oRequestAnimationFrame||function(e){return window.setTimeout(e,1e3/60)},f=window.cancelAnimationFrame||window.webkitCancelAnimationFrame||window.mozCancelAnimationFrame||window.msCancelAnimationFrame||window.oCancelAnimationFrame||window.clearTimeout,m=function(e){return new Array(e).fill(0).map(function(e,t){return t})},h=Object.assign||function(e){for(var t=1;t<arguments.length;t++){var n=arguments[t];for(var o in n)Object.prototype.hasOwnProperty.call(n,o)&&(e[o]=n[o])}return e},p=function(){function e(e,t){for(var n=0;n<t.length;n++){var o=t[n];o.enumerable=o.enumerable||!1,o.configurable=!0,"value"in o&&(o.writable=!0),Object.defineProperty(e,o.key,o)}}return function(t,n,o){return n&&e(t.prototype,n),o&&e(t,o),t}}();var y=function(){function e(t,n){var o=this;!function(e,t){if(!(e instanceof t))throw new TypeError("Cannot call a class as a function")}(this,e),this.randomPoints=function(){return m(o.c.count).map(function(){return{x:Math.random()*o.canvas.width,y:Math.random()*o.canvas.height,xa:2*Math.random()-1,ya:2*Math.random()-1,max:6e3}})},this.el=t,this.c=h({zIndex:-1,opacity:.5,color:"0,0,0",pointColor:"0,0,0",count:99},n),this.canvas=this.newCanvas(),this.context=this.canvas.getContext("2d"),this.points=this.randomPoints(),this.current={x:null,y:null,max:2e4},this.all=this.points.concat([this.current]),this.bindEvent(),this.requestFrame(this.drawCanvas)}return p(e,[{key:"bindEvent",value:function(){var e=this;d(this.el,function(){e.canvas.width=e.el.clientWidth,e.canvas.height=e.el.clientHeight}),this.onmousemove=window.onmousemove,window.onmousemove=function(t){e.current.x=t.clientX-e.el.offsetLeft+document.scrollingElement.scrollLeft,e.current.y=t.clientY-e.el.offsetTop+document.scrollingElement.scrollTop,e.onmousemove&&e.onmousemove(t)},this.onmouseout=window.onmouseout,window.onmouseout=function(){e.current.x=null,e.current.y=null,e.onmouseout&&e.onmouseout()}}},{key:"newCanvas",value:function(){"static"===getComputedStyle(this.el).position&&(this.el.style.position="relative");var e,t=document.createElement("canvas");return t.style.cssText="display:block;position:absolute;top:0;left:0;height:100%;width:100%;overflow:hidden;pointer-events:none;z-index:"+(e=this.c).zIndex+";opacity:"+e.opacity,t.width=this.el.clientWidth,t.height=this.el.clientHeight,this.el.appendChild(t),t}},{key:"requestFrame",value:function(e){var t=this;this.tid=v(function(){return e.call(t)})}},{key:"drawCanvas",value:function(){var e=this,t=this.context,n=this.canvas.width,o=this.canvas.height,i=this.current,r=this.points,a=this.all;t.clearRect(0,0,n,o);var s=void 0,u=void 0,c=void 0,l=void 0,d=void 0,v=void 0;r.forEach(function(r,f){for(r.x+=r.xa,r.y+=r.ya,r.xa*=r.x>n||r.x<0?-1:1,r.ya*=r.y>o||r.y<0?-1:1,t.fillStyle="rgba("+e.c.pointColor+")",t.fillRect(r.x-.5,r.y-.5,1,1),u=f+1;u<a.length;u++)null!==(s=a[u]).x&&null!==s.y&&(l=r.x-s.x,d=r.y-s.y,(v=l*l+d*d)<s.max&&(s===i&&v>=s.max/2&&(r.x-=.03*l,r.y-=.03*d),c=(s.max-v)/s.max,t.beginPath(),t.lineWidth=c/2,t.strokeStyle="rgba("+e.c.color+","+(c+.2)+")",t.moveTo(r.x,r.y),t.lineTo(s.x,s.y),t.stroke()))}),this.requestFrame(this.drawCanvas)}},{key:"destroy",value:function(){l(this.el),window.onmousemove=this.onmousemove,window.onmouseout=this.onmouseout,f(this.tid),this.canvas.parentNode.removeChild(this.canvas)}}]),e}();y.version="2.0.4";var w,b;new y(document.body,(w=document.getElementsByTagName("script"),{zIndex:(b=w[w.length-1]).getAttribute("zIndex"),opacity:b.getAttribute("opacity"),color:b.getAttribute("color"),pointColor:b.getAttribute("pointColor"),count:Number(b.getAttribute("count"))||99}))}();
亲自实验通过，可用！