网站特效代码（背景彩带以及点击烟花特效）
Posted _瞳孔
tags:
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这两个特效代码都是我找了很久才找到的，但是我没有本地保存代码的习惯，而项目里也暂时不用，所以为了避免遗失，我还是贴到这里吧。
背景彩带：
(function (name, factory)
if (typeof window === "object")
window[name] = factory();
)("Ribbons", function ()
var _w = window, _b = document.body, _d = document.documentElement;
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;
;
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: 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
;
;
var Point = function (x, y)
this.x = 0;
this.y = 0;
this.set(x, y);
;
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;
;
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 =
colorSaturation: "80%",
colorBrightness: "60%",
colorAlpha: 0.65,
colorCycleSpeed: 6,
verticalPosition: "center",
horizontalSpeed: 200,
ribbonCount: 4,
strokeSize: 0,
parallaxAmount: -0.5,
animateSections: true
;
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];
, init: function ()
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"] = "#1f1f1f";
this._canvas.id = "bgCanvas";
this._onResize();
this._context = this._canvas.getContext("2d");
this._context.clearRect(0, 0, this._width, this._height);
this._context.globalAlpha = this._options.colorAlpha;
// 这里可以设置是否随着窗口的滚动而滚动
window.addEventListener("resize", this._onResize);
window.addEventListener("scroll", this._onScroll);
// 这里设置添加的位置
var body_ = document.getElementsByTagName('body')[0];
body_.appendChild(this._canvas);
catch (e)
console.warn("Canvas Context Error: " + e.toString());
return;
this._onDraw();
, addRibbon: function ()
var dir = Math.round(random(1, 9)) > 5 ? "right" : "left", stop = 1000, hide = 200, min = 0 - hide,
max = this._width + hide, movex = 0, movey = 0, startx = dir === "right" ? min : max,
starty = Math.round(random(0, this._height));
if (/^(top|min)$/i.test(this._options.verticalPosition))
starty = 0 + hide;
else if (/^(middle|center)$/i.test(this._options.verticalPosition))
starty = this._height / 2;
else if (/^(bottom|max)$/i.test(this._options.verticalPosition))
starty = this._height - hide;
var ribbon = [], point1 = new Point(startx, starty), point2 = new Point(startx, starty), point3 = null,
color = Math.round(random(0, 360)), delay = 0;
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(
point1: new Point(point1.x, point1.y),
point2: new Point(point2.x, point2.y),
point3: point3,
color: color,
delay: delay,
dir: dir,
alpha: 0,
phase: 0
);
point1.copy(point2);
point2.copy(point3);
delay += 4;
color += this._options.colorCycleSpeed;
this._ribbons.push(ribbon);
, _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;
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