前言

页脚养鱼效果我也是折腾了蛮久的,奈何自己太菜,出现了一些问题也不知道怎么解决,查询一些博客,相关的描述也很简单。这里参考了Ln大佬的博客,总算是搞定了。

Ln’s Blog ——《如何在页脚养鱼》:https://weilining.github.io/204.html

最终效果在本站页脚,向下滑动即可看到。


操作方法

参考文章一共介绍了两种方法,第一种是有针对于Butterfly主题的修改。第二种方法是通用方法(其他也主题可参考)

方法一

注:方法一直接将原本的js代码搬运放置本地。

  1. \themes\butterfly\source\js路径下创建一个fish.js文件,并写入如下代码:

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    fish();
    function fish() {
    return (
    $("footer").append(
    '<div class="fish_container" id="jsi-flying-fish-container"></div>'
    ),
    $(".fish_container").css({
    "z-index": -1,
    width: "100%",
    height: "160px",
    margin: 0,
    padding: 0,
    }),
    $("#footer-wrap").css({
    position: "absolute",
    "text-align": "center",
    top: 0,
    right: 0,
    left: 0,
    bottom: 0,
    }),
    this
    );
    }
    var RENDERER = {
    POINT_INTERVAL : 5,
    FISH_COUNT : 3,
    MAX_INTERVAL_COUNT : 50,
    INIT_HEIGHT_RATE : 0.5,
    THRESHOLD : 50,

    init : function(){
    this.setParameters();
    this.reconstructMethods();
    this.setup();
    this.bindEvent();
    this.render();
    },
    setParameters : function(){
    this.$window = $(window);
    this.$container = $('#jsi-flying-fish-container');
    this.$canvas = $('<canvas />');
    this.context = this.$canvas.appendTo(this.$container).get(0).getContext('2d');
    this.points = [];
    this.fishes = [];
    this.watchIds = [];
    },
    createSurfacePoints : function(){
    var count = Math.round(this.width / this.POINT_INTERVAL);
    this.pointInterval = this.width / (count - 1);
    this.points.push(new SURFACE_POINT(this, 0));

    for(var i = 1; i < count; i++){
    var point = new SURFACE_POINT(this, i * this.pointInterval),
    previous = this.points[i - 1];

    point.setPreviousPoint(previous);
    previous.setNextPoint(point);
    this.points.push(point);
    }
    },
    reconstructMethods : function(){
    this.watchWindowSize = this.watchWindowSize.bind(this);
    this.jdugeToStopResize = this.jdugeToStopResize.bind(this);
    this.startEpicenter = this.startEpicenter.bind(this);
    this.moveEpicenter = this.moveEpicenter.bind(this);
    this.reverseVertical = this.reverseVertical.bind(this);
    this.render = this.render.bind(this);
    },
    setup : function(){
    this.points.length = 0;
    this.fishes.length = 0;
    this.watchIds.length = 0;
    this.intervalCount = this.MAX_INTERVAL_COUNT;
    this.width = this.$container.width();
    this.height = this.$container.height();
    this.fishCount = this.FISH_COUNT * this.width / 500 * this.height / 500;
    this.$canvas.attr({width : this.width, height : this.height});
    this.reverse = false;

    this.fishes.push(new FISH(this));
    this.createSurfacePoints();
    },
    watchWindowSize : function(){
    this.clearTimer();
    this.tmpWidth = this.$window.width();
    this.tmpHeight = this.$window.height();
    this.watchIds.push(setTimeout(this.jdugeToStopResize, this.WATCH_INTERVAL));
    },
    clearTimer : function(){
    while(this.watchIds.length > 0){
    clearTimeout(this.watchIds.pop());
    }
    },
    jdugeToStopResize : function(){
    var width = this.$window.width(),
    height = this.$window.height(),
    stopped = (width == this.tmpWidth && height == this.tmpHeight);

    this.tmpWidth = width;
    this.tmpHeight = height;

    if(stopped){
    this.setup();
    }
    },
    bindEvent : function(){
    this.$window.on('resize', this.watchWindowSize);
    this.$container.on('mouseenter', this.startEpicenter);
    this.$container.on('mousemove', this.moveEpicenter);
    this.$container.on('click', this.reverseVertical);
    },
    getAxis : function(event){
    var offset = this.$container.offset();

    return {
    x : event.clientX - offset.left + this.$window.scrollLeft(),
    y : event.clientY - offset.top + this.$window.scrollTop()
    };
    },
    startEpicenter : function(event){
    this.axis = this.getAxis(event);
    },
    moveEpicenter : function(event){
    var axis = this.getAxis(event);

    if(!this.axis){
    this.axis = axis;
    }
    this.generateEpicenter(axis.x, axis.y, axis.y - this.axis.y);
    this.axis = axis;
    },
    generateEpicenter : function(x, y, velocity){
    if(y < this.height / 2 - this.THRESHOLD || y > this.height / 2 + this.THRESHOLD){
    return;
    }
    var index = Math.round(x / this.pointInterval);

    if(index < 0 || index >= this.points.length){
    return;
    }
    this.points[index].interfere(y, velocity);
    },
    reverseVertical : function(){
    this.reverse = !this.reverse;

    for(var i = 0, count = this.fishes.length; i < count; i++){
    this.fishes[i].reverseVertical();
    }
    },
    controlStatus : function(){
    for(var i = 0, count = this.points.length; i < count; i++){
    this.points[i].updateSelf();
    }
    for(var i = 0, count = this.points.length; i < count; i++){
    this.points[i].updateNeighbors();
    }
    if(this.fishes.length < this.fishCount){
    if(--this.intervalCount == 0){
    this.intervalCount = this.MAX_INTERVAL_COUNT;
    this.fishes.push(new FISH(this));
    }
    }
    },
    render : function(){
    requestAnimationFrame(this.render);
    this.controlStatus();
    this.context.clearRect(0, 0, this.width, this.height);
    this.context.fillStyle = 'hsl(0, 0%, 95%)';

    for(var i = 0, count = this.fishes.length; i < count; i++){
    this.fishes[i].render(this.context);
    }
    this.context.save();
    this.context.globalCompositeOperation = 'xor';
    this.context.beginPath();
    this.context.moveTo(0, this.reverse ? 0 : this.height);

    for(var i = 0, count = this.points.length; i < count; i++){
    this.points[i].render(this.context);
    }
    this.context.lineTo(this.width, this.reverse ? 0 : this.height);
    this.context.closePath();
    this.context.fill();
    this.context.restore();
    }
    };
    var SURFACE_POINT = function(renderer, x){
    this.renderer = renderer;
    this.x = x;
    this.init();
    };
    SURFACE_POINT.prototype = {
    SPRING_CONSTANT : 0.03,
    SPRING_FRICTION : 0.9,
    WAVE_SPREAD : 0.3,
    ACCELARATION_RATE : 0.01,

    init : function(){
    this.initHeight = this.renderer.height * this.renderer.INIT_HEIGHT_RATE;
    this.height = this.initHeight;
    this.fy = 0;
    this.force = {previous : 0, next : 0};
    },
    setPreviousPoint : function(previous){
    this.previous = previous;
    },
    setNextPoint : function(next){
    this.next = next;
    },
    interfere : function(y, velocity){
    this.fy = this.renderer.height * this.ACCELARATION_RATE * ((this.renderer.height - this.height - y) >= 0 ? -1 : 1) * Math.abs(velocity);
    },
    updateSelf : function(){
    this.fy += this.SPRING_CONSTANT * (this.initHeight - this.height);
    this.fy *= this.SPRING_FRICTION;
    this.height += this.fy;
    },
    updateNeighbors : function(){
    if(this.previous){
    this.force.previous = this.WAVE_SPREAD * (this.height - this.previous.height);
    }
    if(this.next){
    this.force.next = this.WAVE_SPREAD * (this.height - this.next.height);
    }
    },
    render : function(context){
    if(this.previous){
    this.previous.height += this.force.previous;
    this.previous.fy += this.force.previous;
    }
    if(this.next){
    this.next.height += this.force.next;
    this.next.fy += this.force.next;
    }
    context.lineTo(this.x, this.renderer.height - this.height);
    }
    };
    var FISH = function(renderer){
    this.renderer = renderer;
    this.init();
    };
    FISH.prototype = {
    GRAVITY : 0.4,

    init : function(){
    this.direction = Math.random() < 0.5;
    this.x = this.direction ? (this.renderer.width + this.renderer.THRESHOLD) : -this.renderer.THRESHOLD;
    this.previousY = this.y;
    this.vx = this.getRandomValue(4, 10) * (this.direction ? -1 : 1);

    if(this.renderer.reverse){
    this.y = this.getRandomValue(this.renderer.height * 1 / 10, this.renderer.height * 4 / 10);
    this.vy = this.getRandomValue(2, 5);
    this.ay = this.getRandomValue(0.05, 0.2);
    }else{
    this.y = this.getRandomValue(this.renderer.height * 6 / 10, this.renderer.height * 9 / 10);
    this.vy = this.getRandomValue(-5, -2);
    this.ay = this.getRandomValue(-0.2, -0.05);
    }
    this.isOut = false;
    this.theta = 0;
    this.phi = 0;
    },
    getRandomValue : function(min, max){
    return min + (max - min) * Math.random();
    },
    reverseVertical : function(){
    this.isOut = !this.isOut;
    this.ay *= -1;
    },
    controlStatus : function(context){
    this.previousY = this.y;
    this.x += this.vx;
    this.y += this.vy;
    this.vy += this.ay;

    if(this.renderer.reverse){
    if(this.y > this.renderer.height * this.renderer.INIT_HEIGHT_RATE){
    this.vy -= this.GRAVITY;
    this.isOut = true;
    }else{
    if(this.isOut){
    this.ay = this.getRandomValue(0.05, 0.2);
    }
    this.isOut = false;
    }
    }else{
    if(this.y < this.renderer.height * this.renderer.INIT_HEIGHT_RATE){
    this.vy += this.GRAVITY;
    this.isOut = true;
    }else{
    if(this.isOut){
    this.ay = this.getRandomValue(-0.2, -0.05);
    }
    this.isOut = false;
    }
    }
    if(!this.isOut){
    this.theta += Math.PI / 20;
    this.theta %= Math.PI * 2;
    this.phi += Math.PI / 30;
    this.phi %= Math.PI * 2;
    }
    this.renderer.generateEpicenter(this.x + (this.direction ? -1 : 1) * this.renderer.THRESHOLD, this.y, this.y - this.previousY);

    if(this.vx > 0 && this.x > this.renderer.width + this.renderer.THRESHOLD || this.vx < 0 && this.x < -this.renderer.THRESHOLD){
    this.init();
    }
    },
    render : function(context){
    context.save();
    context.translate(this.x, this.y);
    context.rotate(Math.PI + Math.atan2(this.vy, this.vx));
    context.scale(1, this.direction ? 1 : -1);
    context.beginPath();
    context.moveTo(-30, 0);
    context.bezierCurveTo(-20, 15, 15, 10, 40, 0);
    context.bezierCurveTo(15, -10, -20, -15, -30, 0);
    context.fill();

    context.save();
    context.translate(40, 0);
    context.scale(0.9 + 0.2 * Math.sin(this.theta), 1);
    context.beginPath();
    context.moveTo(0, 0);
    context.quadraticCurveTo(5, 10, 20, 8);
    context.quadraticCurveTo(12, 5, 10, 0);
    context.quadraticCurveTo(12, -5, 20, -8);
    context.quadraticCurveTo(5, -10, 0, 0);
    context.fill();
    context.restore();

    context.save();
    context.translate(-3, 0);
    context.rotate((Math.PI / 3 + Math.PI / 10 * Math.sin(this.phi)) * (this.renderer.reverse ? -1 : 1));

    context.beginPath();

    if(this.renderer.reverse){
    context.moveTo(5, 0);
    context.bezierCurveTo(10, 10, 10, 30, 0, 40);
    context.bezierCurveTo(-12, 25, -8, 10, 0, 0);
    }else{
    context.moveTo(-5, 0);
    context.bezierCurveTo(-10, -10, -10, -30, 0, -40);
    context.bezierCurveTo(12, -25, 8, -10, 0, 0);
    }
    context.closePath();
    context.fill();
    context.restore();
    context.restore();
    this.controlStatus(context);
    }
    };
    $(function(){
    RENDERER.init();
    });

    并在主题配置文件_config.butterfly.ymlbottom处引入该文件:

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    inject:
    bottom:
    - <script src="/js/fish.js"></script>
  2. \themes\butterfly\source\css目录下新建footer.css文件,并写入如下代码:

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    .fish_container{
    z-index: -1;
    width: "100%";
    height: "160px";
    margin: 0;
    padding: 0;
    }
    #footer-wrap{
    position: absolute;
    text-align: center;
    padding: 20px 20px;
    top: 0;
    right: 0;
    left: 0;
    bottom: 0;
    }

    并在主题配置文件_config.butterfly.ymlhead处引入该文件:

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    inject:
    head:
    - <link rel="stylesheet" href="/css/footer.css">
  3. 保存配置,重新部署,即可看到效果。

方法二

打开站点的主题配置文件_config.butterfly.yml,找到inject,在bottom处直接引入以下链接:

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- <script src="https://gcore.jsdelivr.net/gh/xiabo2/CDN@latest/fishes.js"></script>

方法三

  1. 找到footer.pug文件:\themes\butterfly\layout\includes\footer.pug,写入以下内容:

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    #jsi-flying-fish-container.container
    script(src='js/fish.js')
    style.

    @media only screen and (max-width: 767px){
    #sidebar_search_box input[type=text]{width:calc(100% - 24px)}
    }
  2. 打开站点的主题配置文件_config.butterfly.yml,找到inject,在bottom处直接引入https://gcore.jsdelivr.net/gh/xiabo2/CDN@latest/fish.js

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    - <script src="https://gcore.jsdelivr.net/gh/xiabo2/CDN@latest/fish.js"></script>

    注意:引入的js文件需要依赖jquery,所以在之前如果没有引用过的就需要在bottom处的最开始引入:

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    - <script src="https://cdn.bootcss.com/jquery/3.4.1/jquery.min.js"></script>
  3. 这样效果就出现了。但是引入之后页脚会过高,需要修改footer.styl文件:\themes\butterfly\source\css\_layout\footer.styl:

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    #footer
    position: relative
    background: $light-blue
    background-attachment: local
    background-position: bottom
    background-size: cover

    if hexo-config('footer_bg') != false
    &:before
    position: absolute
    width: 100%
    height: 100%
    background-color: alpha($dark-black, .1)
    content: ''

    #footer-wrap
    position: absolute
    padding: 1.2rem 1rem 1.4rem
    color: var(--light-grey)
    text-align: center
    left: 0
    right: 0
    top: 0
    bottom: 0

    a
    color: var(--light-grey)

    &:hover
    text-decoration: underline

    .footer-separator
    margin: 0 .2rem

    .icp-icon
    padding: 0 4px
    vertical-align: text-bottom
    max-height: 1.4em
    width auto
  4. 参考文章的技术流程写到这里就结束了,如果还有页脚文字被遮挡的情况,可以修改页脚的透明度,在\themes\butterfly\source\css路径下创建一个xxx.css文件,在文件中添加如下代码:

    • 页脚半透明

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      /* 页脚半透明 */
      #footer {
      background: rgba(255, 255, 255, 0);
      color: #000;
      border-top-right-radius: 20px;
      border-top-left-radius: 20px;
      backdrop-filter: saturate(100%) blur(5px)
      }

      #footer::before {
      background: rgba(255,255,255,0)
      }

      #footer #footer-wrap {
      color: var(--font-color);
      }

      #footer #footer-wrap a {
      color: var(--font-color);
      }
    • 页脚全透明

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      /* 页脚透明 */
      #footer {
      background: transparent !important;
      }

    然后将该文件引入到injecthead处:

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    - <link rel="stylesheet" href="/css/xxx.css">
  5. 至此操作结束,去看看你的页脚有没有发生变化吧。

补充

还有一个更为简单的方法,引入带有颜色的页脚养鱼,效果如下:

只需要在_config.butterfly.yml文件中,找到inject,在bottom处直接引入:https://uuuuu.cf/js/fishes.js

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- <script defer src="https://uuuuu.cf/js/fishes.js"></script> # 页脚养鱼(彩色)

注意:该操作同样需要在之前引入jquery


结尾

在魔改的道路上乐此不疲,虽然有时真的很“崩溃”。