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  • 博客园之背景特效

    一, 彩带

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    </body>
    <script async="" type="text/javascript">
        (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,
                    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;
                                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 + " )";
                        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;
                }, _onDraw: function () {
                    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);
                    for (var a = 0; a < this._ribbons.length; ++a) {
                        var ribbon = this._ribbons[a], numSections = ribbon.length, numDone = 0;
                        for (var b = 0; b < numSections; ++b) {
                            if (this._drawRibbonSection(ribbon[b])) {
                                numDone++;
                            }
                        }
                        if (numDone >= numSections) {
                            this._ribbons[a] = null;
                        }
                    }
                    if (this._ribbons.length < this._options.ribbonCount) {
                        this.addRibbon();
                    }
                    requestAnimationFrame(this._onDraw);
                }, _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;
                        }
                    }
                }, _onScroll: function (e) {
                    var screen = screenInfo(e);
                    this._scroll = screen.scrolly;
                }
            };
            return Factory;
        });
        new Ribbons();
    </script>
    </html>
    

    二, 粒子球

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta charset="UTF-8">
        <title>Title</title>
    </head>
    <body>
    <!--网格动态背景开始-->
    <script type="text/javascript">
    
        !function () {
            //封装方法,压缩之后减少文件大小
            function get_attribute(node, attr, default_value) {
                return node.getAttribute(attr) || default_value;
            }
    
            //封装方法,压缩之后减少文件大小
            function get_by_tagname(name) {
                return document.getElementsByTagName(name);
            }
    
            //获取配置参数
            function get_config_option() {
                var scripts = get_by_tagname("script"),
                    script_len = scripts.length,
                    script = scripts[script_len - 1]; //当前加载的script
                return {
                    l: script_len, //长度,用于生成id用
                    z: get_attribute(script, "zIndex", -1), //z-index
                    o: get_attribute(script, "opacity", 0.8), //opacity
                    c: get_attribute(script, "color", "255,255,255"), //color
                    n: get_attribute(script, "count", 350) //count
                };
            }
    
            //设置canvas的高宽
            function set_canvas_size() {
                canvas_width = the_canvas.width = window.innerWidth || document.documentElement.clientWidth || document.body.clientWidth,
                    canvas_height = the_canvas.height = window.innerHeight || document.documentElement.clientHeight || document.body.clientHeight;
            }
    
            //绘制过程
            function draw_canvas() {
                context.clearRect(0, 0, canvas_width, canvas_height);
                //随机的线条和当前位置联合数组
                var e, i, d, x_dist, y_dist, dist; //临时节点
                //遍历处理每一个点
                random_points.forEach(function (r, idx) {
                    r.x += r.xa,
                        r.y += r.ya, //移动
                        r.xa *= r.x > canvas_width || r.x < 0 ? -1 : 1,
                        r.ya *= r.y > canvas_height || r.y < 0 ? -1 : 1, //碰到边界,反向反弹
                        context.fillRect(r.x - 0.5, r.y - 0.5, 1, 1); //绘制一个宽高为1的点
                    //从下一个点开始
                    for (i = idx + 1; i < all_array.length; i++) {
                        e = all_array[i];
                        // 当前点存在
                        if (null !== e.x && null !== e.y) {
                            x_dist = r.x - e.x; //x轴距离 l
                            y_dist = r.y - e.y; //y轴距离 n
                            dist = x_dist * x_dist + y_dist * y_dist; //总距离, m
    
                            dist < e.max && (e === current_point && dist >= e.max / 2 && (r.x -= 0.03 * x_dist, r.y -= 0.03 * y_dist), //靠近的时候加速
                                d = (e.max - dist) / e.max,
                                context.beginPath(),
                                context.lineWidth = d / 2,
                                context.strokeStyle = "#000000",
                                context.moveTo(r.x, r.y),
                                context.lineTo(e.x, e.y),
                                context.stroke());
                        }
                    }
                }), frame_func(draw_canvas);
            }
    
            //创建画布,并添加到body中
            var the_canvas = document.createElement("canvas"), //画布
                config = get_config_option(), //配置
                canvas_id = "c_n" + config.l, //canvas id
                context = the_canvas.getContext("2d"), canvas_width, canvas_height,
                frame_func = window.requestAnimationFrame || window.webkitRequestAnimationFrame || window.mozRequestAnimationFrame || window.oRequestAnimationFrame || window.msRequestAnimationFrame || function (func) {
                    window.setTimeout(func, 1000 / 40);
                }, random = Math.random,
                current_point = {
                    x: null, //当前鼠标x
                    y: null, //当前鼠标y
                    max: 20000 // 圈半径的平方
                },
                all_array;
            the_canvas.id = canvas_id;
            the_canvas.style.cssText = "position:fixed;top:0;left:0;z-index:" + config.z + ";opacity:" + config.o;
            get_by_tagname("body")[0].appendChild(the_canvas);
    
            //初始化画布大小
            set_canvas_size();
            window.onresize = set_canvas_size;
            //当时鼠标位置存储,离开的时候,释放当前位置信息
            window.onmousemove = function (e) {
                e = e || window.event;
                current_point.x = e.clientX;
                current_point.y = e.clientY;
            }, window.onmouseout = function () {
                current_point.x = null;
                current_point.y = null;
            };
            //随机生成config.n条线位置信息
            for (var random_points = [], i = 0; config.n > i; i++) {
                var x = random() * canvas_width, //随机位置
                    y = random() * canvas_height,
                    xa = 2 * random() - 1, //随机运动方向
                    ya = 2 * random() - 1;
                // 随机点
                random_points.push({
                    x: x,
                    y: y,
                    xa: xa,
                    ya: ya,
                    max: 6000 //沾附距离
                });
            }
            all_array = random_points.concat([current_point]);
            //0.1秒后绘制
            setTimeout(function () {
                draw_canvas();
            }, 100);
        }();
    </script>
    </body>
    </html>
    

    三, 滴墨水

    <!DOCTYPE html>
    <html lang="en">
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=utf-8">
        <title>canvas</title>
        <style type="text/css">
            * {
                margin: 0;
                padding: 0;
            }
    
            body {
                 100%;
                height: 100%;
                overflow: hidden;
                position: fixed;
            }
        </style>
        <script src="http://www.jq22.com/jquery/jquery-1.10.2.js"></script>
        <script src="https://libs.baidu.com/jquery/1.10.2/jquery.min.js"></script>
    </head>
    <body>
    <canvas id="c" width="1536"></canvas>
    <script type="text/javascript">
        $(document).ready(function () {
            var canvas = document.getElementById("c");
            var ctx = canvas.getContext("2d");
            var c = $("#c");
            var w, h;
            var pi = Math.PI;
            var all_attribute = {
                num: 100,            			 // 个数
                start_probability: 0.1,		     // 如果数量小于num,有这些几率添加一个新的
                radius_min: 1,   			     // 初始半径最小值
                radius_max: 2,   			     // 初始半径最大值
                radius_add_min: .3,               // 半径增加最小值
                radius_add_max: .5,               // 半径增加最大值
                opacity_min: 0.3,                 // 初始透明度最小值
                opacity_max: 0.5, 				 // 初始透明度最大值
                opacity_prev_min: .003,            // 透明度递减值最小值
                opacity_prev_max: .005,            // 透明度递减值最大值
                light_min: 40,                 // 颜色亮度最小值
                light_max: 70,                 // 颜色亮度最大值
            };
            var style_color = find_random(0, 360);
            var all_element = [];
            window_resize();
    
            function start() {
                window.requestAnimationFrame(start);
                style_color += .1;
                ctx.fillStyle = 'hsl(' + style_color + ',100%,97%)';
                ctx.fillRect(0, 0, w, h);
                if (all_element.length < all_attribute.num && Math.random() < all_attribute.start_probability) {
                    all_element.push(new ready_run);
                }
                all_element.map(function (line) {
                    line.to_step();
                })
            }
    
            function ready_run() {
                this.to_reset();
            }
    
            ready_run.prototype = {
                to_reset: function () {
                    var t = this;
                    t.x = find_random(0, w);
                    t.y = find_random(0, h);
                    t.radius = find_random(all_attribute.radius_min, all_attribute.radius_max);
                    t.radius_change = find_random(all_attribute.radius_add_min, all_attribute.radius_add_max);
                    t.opacity = find_random(all_attribute.opacity_min, all_attribute.opacity_max);
                    t.opacity_change = find_random(all_attribute.opacity_prev_min, all_attribute.opacity_prev_max);
                    t.light = find_random(all_attribute.light_min, all_attribute.light_max);
                    t.color = 'hsl(' + style_color + ',100%,' + t.light + '%)';
                },
                to_step: function () {
                    var t = this;
                    t.opacity -= t.opacity_change;
                    t.radius += t.radius_change;
                    if (t.opacity <= 0) {
                        t.to_reset();
                        return false;
                    }
                    ctx.fillStyle = t.color;
                    ctx.globalAlpha = t.opacity;
                    ctx.beginPath();
                    ctx.arc(t.x, t.y, t.radius, 0, 2 * pi, true);
                    ctx.closePath();
                    ctx.fill();
                    ctx.globalAlpha = 1;
                }
            }
    
            function window_resize() {
                w = window.innerWidth;
                h = window.innerHeight;
                canvas.width = w;
                canvas.height = h;
            }
    
            $(window).resize(function () {
                window_resize();
            });
    
            function find_random(num_one, num_two) {
                return Math.random() * (num_two - num_one) + num_one;
            }
    
            (function () {
                var lastTime = 0;
                var vendors = ['webkit', 'moz'];
                for (var xx = 0; xx < vendors.length && !window.requestAnimationFrame; ++xx) {
                    window.requestAnimationFrame = window[vendors[xx] + 'RequestAnimationFrame'];
                    window.cancelAnimationFrame = window[vendors[xx] + 'CancelAnimationFrame'] ||
                        window[vendors[xx] + 'CancelRequestAnimationFrame'];
                }
    
                if (!window.requestAnimationFrame) {
                    window.requestAnimationFrame = function (callback, element) {
                        var currTime = new Date().getTime();
                        var timeToCall = Math.max(0, 16.7 - (currTime - lastTime));
                        var id = window.setTimeout(function () {
                            callback(currTime + timeToCall);
                        }, timeToCall);
                        lastTime = currTime + timeToCall;
                        return id;
                    };
                }
                if (!window.cancelAnimationFrame) {
                    window.cancelAnimationFrame = function (id) {
                        clearTimeout(id);
                    };
                }
            }());
            start();
        });
    </script>
    </body>
    </html>
    
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  • 原文地址:https://www.cnblogs.com/zyyhxbs/p/11423517.html
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