写博客的人都喜欢优化自己的博客主页，博主也一样，找了一些背景控件，像canvas-nest.js等等，最终选择了ribbons.js，并基于源码，稍作了一丁点的修改，这里分享出来
(function (name, factory) { if (typeof window === "object") { window[name] = factory(); } }) ("Ribbons", function () { var _w = window, _b = document.body, _d = document.documentElement; //随机函数 var random = function () { if (arguments.length === 1) { if (Array.isArray(arguments[0])) { var index = Math.round(random(0, arguments[0].length - 1)); return arguments[0][index]; } return random(0, arguments[0]); } else if (arguments.length === 2) { return Math.random() * (arguments[1] - arguments[0]) + arguments[0]; } return 0; }; //屏幕信息 var screenInfo = function (e) { var width = Math.max(0, _w.innerWidth || _d.clientWidth || _b.clientWidth || 0), height = Math.max(0, _w.innerHeight || _d.clientHeight || _b.clientHeight || 0), scrollx = Math.max(0, _w.pageXOffset || _d.scrollLeft || _b.scrollLeft || 0) - (_d.clientLeft || 0), scrolly = Math.max(0, _w.pageYOffset || _d.scrollTop || _b.scrollTop || 0) - (_d.clientTop || 0); return { width, height: height, ratio: width / height, centerx: width / 2, centery: height / 2, scrollx: scrollx, scrolly: scrolly }; }; var mouseInfo = function (e) { var screen = screenInfo(e), mousex = e ? Math.max(0, e.pageX || e.clientX || 0) : 0, mousey = e ? Math.max(0, e.pageY || e.clientY || 0) : 0; return { mousex: mousex, mousey: mousey, centerx: mousex - screen.width / 2, centery: mousey - screen.height / 2 }; }; //点 var Point = function (x, y) { this.x = 0; this.y = 0; this.set(x, y); }; //点运算 Point.prototype = { constructor: Point, set: function (x, y) { this.x = x || 0; this.y = y || 0; }, copy: function (point) { this.x = point.x || 0; this.y = point.y || 0; return this; }, multiply: function (x, y) { this.x *= x || 1; this.y *= y || 1; return this; }, divide: function (x, y) { this.x /= x || 1; this.y /= y || 1; return this; }, add: function (x, y) { this.x += x || 0; this.y += y || 0; return this; }, subtract: function (x, y) { this.x -= x || 0; this.y -= y || 0; return this; }, clampX: function (min, max) { this.x = Math.max(min, Math.min(this.x, max)); return this; }, clampY: function (min, max) { this.y = Math.max(min, Math.min(this.y, max)); return this; }, flipX: function () { this.x *= -1; return this; }, flipY: function () { this.y *= -1; return this; } }; //丝带画板 var Factory = function (options) { this._canvas = null; this._context = null; this._sto = null; this._width = 0; this._height = 0; this._scroll = 0; this._ribbons = []; this._options = { id: "bgCanvas",//画板Id backgroundColor: "#1f1f1f",//画板背景 colorSaturation: "80%",//纯度 colorBrightness: "60%",//亮度 colorAlpha: 0.65,//透明度 colorCycleSpeed: 6,//丝带不同块之间的色彩变化量 verticalPosition: "center",//丝带相对于屏幕的初始位置：top/min 屏幕最上方，middle|center 中间，bottom|max 屏幕最下面 horizontalSpeed: 200,//丝带水平方向移动速度参数（会乘以一个随机值） ribbonCount: 3,//同一时间丝带总条数 strokeSize: 0,//公共边路径样式 parallaxAmount: -0.5,//滚动偏移参数，-1表示不偏移，0表示基于丝带只出现在页面最上面 animateSections: true//丝带块是否偏移，显得有动感 }; this._onDraw = this._onDraw.bind(this); this._onResize = this._onResize.bind(this); this._onScroll = this._onScroll.bind(this); this.setOptions(options); this.init(); }; Factory.prototype = { constructor: Factory, setOptions: function (options) { if (typeof options === "object") { for (var key in options) { if (options.hasOwnProperty(key)) { this._options[key] = options[key]; } } } }, //初始化 init: function () { //初始化画板 try { this._canvas = document.createElement("canvas"); this._canvas.style["display"] = "block"; this._canvas.style["position"] = "fixed"; this._canvas.style["margin"] = "0"; this._canvas.style["padding"] = "0"; this._canvas.style["border"] = "0"; this._canvas.style["outline"] = "0"; this._canvas.style["left"] = "0"; this._canvas.style["top"] = "0"; this._canvas.style["width"] = "100%"; this._canvas.style["height"] = "100%"; this._canvas.style["z-index"] = "-1"; this._canvas.style["background-color"] = this._options.backgroundColor; this._canvas.id = this._options.id; this._onResize(); this._context = this._canvas.getContext("2d"); this._context.clearRect(0, 0, this._width, this._height); this._context.globalAlpha = this._options.colorAlpha; window.addEventListener("resize", this._onResize); window.addEventListener("scroll", this._onScroll); document.body.appendChild(this._canvas); } catch (e) { console.warn("Canvas Context Error: " + e.toString()); return; } //开始绘画 this._onDraw(); }, //生成一条丝带 addRibbon: function () { var dir = Math.round(random(1, 9)) > 5 ? "right" : "left",//丝带延伸方向 stop = 1000, hide = 200, min = 0 - hide, max = this._width + hide, movex = 0, movey = 0, startx = dir === "right" ? min : max,//起始点x左边 starty = Math.round(random(0, this._height));//起始点y左边 //丝带生成的位置 if (/^(top|min)$/i.test(this._options.verticalPosition)) {//最上方 starty = 0 + hide; } else if (/^(middle|center)$/i.test(this._options.verticalPosition)) {//中间 starty = this._height / 2; } else if (/^(bottom|max)$/i.test(this._options.verticalPosition)) {//最下方 starty = this._height - hide; } if (this._options.parallaxAmount !== 0) { starty += this._scroll;//加上滚动 } var ribbon = [], point1 = new Point(startx, starty), point2 = new Point(startx, starty), point3 = null, color = Math.round(random(0, 360)), delay = 0; //从起始位置开始生成一条丝带 //丝带每个分部都是一个三角形，三点确定一个三角形，相邻三角形有一条公共边 while (true) { if (stop <= 0) break; stop--; movex = Math.round((Math.random() * 1 - 0.2) * this._options.horizontalSpeed); movey = Math.round((Math.random() * 1 - 0.5) * (this._height * 0.25)); point3 = new Point(); point3.copy(point2); if (dir === "right") { point3.add(movex, movey); if (point2.x >= max) break; } else if (dir === "left") { point3.subtract(movex, movey); if (point2.x <= min) break; } ribbon.push({ //三点 point1: new Point(point1.x, point1.y), point2: new Point(point2.x, point2.y), point3: point3, color: color,//丝带颜色 delay: delay,//延迟消失 dir: dir,//方向 alpha: 0,//透明度 phase: 0 //随机位移有关参数 }); //公共边 point1.copy(point2); point2.copy(point3); delay += 4; color += this._options.colorCycleSpeed; } this._ribbons.push(ribbon); }, //绘制一个三角形方块 _drawRibbonSection: function (section) { if (section) { if (section.phase >= 1 && section.alpha <= 0) { return true; } if (section.delay <= 0) { section.phase += 0.02; section.alpha = Math.sin(section.phase) * 1; section.alpha = section.alpha <= 0 ? 0 : section.alpha; section.alpha = section.alpha >= 1 ? 1 : section.alpha; if (this._options.animateSections) { var mod = Math.sin(1 + section.phase * Math.PI / 2) * 0.1; if (section.dir === "right") { section.point1.add(mod, 0); section.point2.add(mod, 0); section.point3.add(mod, 0); } else { section.point1.subtract(mod, 0); section.point2.subtract(mod, 0); section.point3.subtract(mod, 0); } section.point1.add(0, mod); section.point2.add(0, mod); section.point3.add(0, mod); } } else { section.delay -= 0.5; } var s = this._options.colorSaturation, l = this._options.colorBrightness, c = "hsla(" + section.color + ", " + s + ", " + l + ", " + section.alpha + " )"; //绘制一个方块 this._context.save(); if (this._options.parallaxAmount !== 0) { this._context.translate(0, this._scroll * this._options.parallaxAmount); } this._context.beginPath(); this._context.moveTo(section.point1.x, section.point1.y); this._context.lineTo(section.point2.x, section.point2.y); this._context.lineTo(section.point3.x, section.point3.y); this._context.fillStyle = c; this._context.fill(); if (this._options.strokeSize > 0) { this._context.lineWidth = this._options.strokeSize; this._context.strokeStyle = c; this._context.lineCap = "round"; this._context.stroke(); } this._context.restore(); } return false; }, //绘制丝带 _onDraw: function () { //清空已经绘制过的丝带 for (var i = 0, t = this._ribbons.length; i < t; ++i) { if (!this._ribbons[i]) { this._ribbons.splice(i, 1); } } this._context.clearRect(0, 0, this._width, this._height);//清空画板 for (var a = 0; a < this._ribbons.length; ++a) { var ribbon = this._ribbons[a], numSections = ribbon ? ribbon.length : 0, numDone = 0; //绘制整条丝带 for (var b = 0; b < numSections; ++b) { if (this._drawRibbonSection(ribbon[b])) { numDone++; } } //丝带已经全部飘过屏幕，设置为null,函数前面会自动清理 if (numDone >= numSections) { this._ribbons[a] = null; } } //随机生成一条丝带 if (this._ribbons.length < this._options.ribbonCount && Math.random() > 0.99) { this.addRibbon(); } //调度交给系统，当需要刷新画板时调用指定的回调函数，用于提高性能 requestAnimationFrame(this._onDraw); }, //重新设置窗体大小时需要获取窗体大小 _onResize: function (e) { var screen = screenInfo(e); this._width = screen.width; this._height = screen.height; if (this._canvas) { this._canvas.width = this._width; this._canvas.height = this._height; if (this._context) { this._context.globalAlpha = this._options.colorAlpha; } } }, //滚动时获取滚动距离 _onScroll: function (e) { var screen = screenInfo(e); this._scroll = screen.scrolly; } }; return Factory; }); //初始化并绘制 new Ribbons({ ribbonCount: 5, parallaxAmount: -0.99 });
注意，在代码的最后面有丝带的初始化
//初始化并绘制 new Ribbons({ ribbonCount: 5, parallaxAmount: -0.99 });
里面可以传的参数有
options = { id: "bgCanvas",//画板Id backgroundColor: "#1f1f1f",//画板背景 colorSaturation: "80%",//纯度 colorBrightness: "60%",//亮度 colorAlpha: 0.65,//透明度 colorCycleSpeed: 6,//丝带不同块之间的色彩变化量 verticalPosition: "center",//丝带相对于屏幕的初始位置：top/min 屏幕最上方，middle|center 中间，bottom|max 屏幕最下面 horizontalSpeed: 200,//丝带水平方向移动速度参数（会乘以一个随机值） ribbonCount: 3,//同一时间丝带总条数 strokeSize: 0,//公共边路径样式 parallaxAmount: -0.5,//滚动偏移参数，-1表示不偏移，0表示基于丝带只出现在页面最上面 animateSections: true//丝带块是否偏移，显得有动感 };
另外这个部分初始化代码可以提取出来放到其他地方去初始化，比如window的onload里面，这里直接这么写是为了将上面的代码封装到一个js文件中，然后直接引用js文件即可，但是注意一下，这里最好在body的最后面引用，否则可能会导致一些页面加载不全导致的问题，如新建一个html文件：
<!DOCTYPE html> <html> <head> <meta charset="utf-8" /> <meta name="viewport" content="width=device-width, initial-scale=1.0" /> <title>Ribbons</title> </head> <body>
<!--这里最好在body的最后面引用js文件--> <!--本地--> <script src="ribbons.js"></script> <!--远程--> <!--<script src="https://blog-static.cnblogs.com/files/shanfeng1000/ribbons.js"></script>--> </body> </html>
浏览器打开html文件
