前言 {#前言}

粒子时钟效果基于 Hexo 博客的 NexT 主题，其他主题的配置方式也可以参考这篇文章。

配置主题 {#配置主题}

为便于维护，通过修改主题配置文件（主题根目录的 _config.yml 文件）实现。打开主题目录下的 _config.yml 文件，新增以下代码片段：

|-----------------|----------------------------------------------------------------------------------------| | 1 2 3 4 | # 侧栏粒子时钟 diy_clock: clock: true # 为 true 时开启粒子时钟，为 false 时关闭粒子时钟 runtime: true |

自定义粒子时钟脚本 {#自定义粒子时钟脚本}

主题目录下新增文件 source/js/custom/clock.js 文件。NexT 主题默认没有 custom 文件夹，需要自己新建。在 clock.js 文件中填入以下代码：

|-----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------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| 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 | (function () { var digit = [ [ [0, 0, 1, 1, 1, 0, 0], [0, 1, 1, 0, 1, 1, 0], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 1, 1, 0, 1, 1, 0], [0, 0, 1, 1, 1, 0, 0] ],//0 [ [0, 0, 0, 1, 1, 0, 0], [0, 1, 1, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [1, 1, 1, 1, 1, 1, 1] ],//1 [ [0, 1, 1, 1, 1, 1, 0], [1, 1, 0, 0, 0, 1, 1], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 1, 1, 0, 0, 0], [0, 1, 1, 0, 0, 0, 0], [1, 1, 0, 0, 0, 0, 0], [1, 1, 0, 0, 0, 1, 1], [1, 1, 1, 1, 1, 1, 1] ],//2 [ [1, 1, 1, 1, 1, 1, 1], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 1, 1, 1, 0, 0], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 1, 1, 1, 1, 1, 0] ],//3 [ [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 1, 1, 1, 0], [0, 0, 1, 1, 1, 1, 0], [0, 1, 1, 0, 1, 1, 0], [1, 1, 0, 0, 1, 1, 0], [1, 1, 1, 1, 1, 1, 1], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 1, 1, 1, 1] ],//4 [ [1, 1, 1, 1, 1, 1, 1], [1, 1, 0, 0, 0, 0, 0], [1, 1, 0, 0, 0, 0, 0], [1, 1, 1, 1, 1, 1, 0], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 1, 1, 1, 1, 1, 0] ],//5 [ [0, 0, 0, 0, 1, 1, 0], [0, 0, 1, 1, 0, 0, 0], [0, 1, 1, 0, 0, 0, 0], [1, 1, 0, 0, 0, 0, 0], [1, 1, 0, 1, 1, 1, 0], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 1, 1, 1, 1, 1, 0] ],//6 [ [1, 1, 1, 1, 1, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 0, 1, 1, 0, 0], [0, 0, 1, 1, 0, 0, 0], [0, 0, 1, 1, 0, 0, 0], [0, 0, 1, 1, 0, 0, 0], [0, 0, 1, 1, 0, 0, 0] ],//7 [ [0, 1, 1, 1, 1, 1, 0], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 1, 1, 1, 1, 1, 0], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 1, 1, 1, 1, 1, 0] ],//8 [ [0, 1, 1, 1, 1, 1, 0], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [1, 1, 0, 0, 0, 1, 1], [0, 1, 1, 1, 0, 1, 1], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 0, 1, 1], [0, 0, 0, 0, 1, 1, 0], [0, 0, 0, 1, 1, 0, 0], [0, 1, 1, 0, 0, 0, 0] ],//9 [ [0, 0, 0, 0, 0, 0, 0], [0, 0, 1, 1, 1, 0, 0], [0, 0, 1, 1, 1, 0, 0], [0, 0, 1, 1, 1, 0, 0], [0, 0, 0, 0, 0, 0, 0], [0, 0, 0, 0, 0, 0, 0], [0, 0, 1, 1, 1, 0, 0], [0, 0, 1, 1, 1, 0, 0], [0, 0, 1, 1, 1, 0, 0], [0, 0, 0, 0, 0, 0, 0] ]//: ]; var canvas = document.getElementById('canvasDiyBlock'); if (canvas.getContext) { var cxt = canvas.getContext('2d'); //声明canvas的宽高 var H = 100, W = 700; canvas.height = H; canvas.width = W; cxt.fillStyle = '#f00'; cxt.fillRect(10, 10, 50, 50); //存储时间数据 var data = []; //存储运动的小球 var balls = []; //设置粒子半径 var R = canvas.height / 20 - 1; (function () { var temp = /(\d)(\d):(\d)(\d):(\d)(\d)/.exec(new Date()); //存储时间数字，由十位小时、个位小时、冒号、十位分钟、个位分钟、冒号、十位秒钟、个位秒钟这7个数字组成 data.push(temp[1], temp[2], 10, temp[3], temp[4], 10, temp[5], temp[6]); })(); /*生成点阵数字*/ function renderDigit(index, num) { for (var i = 0; i < digit[num].length; i++) { for (var j = 0; j < digit[num][i].length; j++) { if (digit[num][i][j] == 1) { cxt.beginPath(); cxt.arc(14 * (R + 2) * index + j * 2 * (R + 1) + (R + 1), i * 2 * (R + 1) + (R + 1), R, 0, 2 * Math.PI); cxt.closePath(); cxt.fill(); } } } } /*更新时钟*/ function updateDigitTime() { var changeNumArray = []; var temp = /(\d)(\d):(\d)(\d):(\d)(\d)/.exec(new Date()); var NewData = []; NewData.push(temp[1], temp[2], 10, temp[3], temp[4], 10, temp[5], temp[6]); for (var i = data.length - 1; i >= 0; i--) { //时间发生变化 if (NewData[i] !== data[i]) { //将变化的数字值和在data数组中的索引存储在changeNumArray数组中 changeNumArray.push(i + '_' + (Number(data[i]) + 1) % 10); } } //增加小球 for (var i = 0; i < changeNumArray.length; i++) { addBalls.apply(this, changeNumArray[i].split('_')); } data = NewData.concat(); } /*更新小球状态*/ function updateBalls() { for (var i = 0; i < balls.length; i++) { balls[i].stepY += balls[i].disY; balls[i].x += balls[i].stepX; balls[i].y += balls[i].stepY; if (balls[i].x > W + R || balls[i].y > H + R) { balls.splice(i, 1); i--; } } } /*增加要运动的小球*/ function addBalls(index, num) { var numArray = [1, 2, 3]; var colorArray = ["#3BE", "#09C", "#A6C", "#93C", "#9C0", "#690", "#FB3", "#F80", "#F44", "#C00"]; for (var i = 0; i < digit[num].length; i++) { for (var j = 0; j < digit[num][i].length; j++) { if (digit[num][i][j] == 1) { var ball = { x: 14 * (R + 2) * index + j * 2 * (R + 1) + (R + 1), y: i * 2 * (R + 1) + (R + 1), stepX: Math.floor(Math.random() * 4 - 2), stepY: -2 * numArray[Math.floor(Math.random() * numArray.length)], color: colorArray[Math.floor(Math.random() * colorArray.length)], disY: 1 }; balls.push(ball); } } } } /*渲染*/ function render() { //重置画布宽度，达到清空画布的效果 canvas.height = 100; //渲染时钟 for (var i = 0; i < data.length; i++) { renderDigit(i, data[i]); } //渲染小球 for (var i = 0; i < balls.length; i++) { cxt.beginPath(); cxt.arc(balls[i].x, balls[i].y, R, 0, 2 * Math.PI); cxt.fillStyle = balls[i].color; cxt.closePath(); cxt.fill(); } } clearInterval(oTimer); var oTimer = setInterval(function () { //更新时钟 updateDigitTime(); //更新小球状态 updateBalls(); //渲染 render(); }, 50); } })(); |

上面这段 js 代码就是粒子时钟的具体实现。

自定义视图 {#自定义视图}

接下来在主题下新增一个视图文件 layout/_custom/clock.swig，用这个文件来引入上面的 js 代码。NexT 主题默认没有 _custom 文件夹，需自行创建。通常情况下，自定义的所有视图统一放置在 _custom 目录下。

|-----------------|-----------------------------------------------------------------------------------------------------------------------------------------| | 1 2 3 4 | <div> <canvas id="canvasDiyBlock" style="width:60%;">当前浏览器不支持canvas，请更换浏览器后再试</canvas> {{- next_js('custom/clock.js') }} </div> |

代码中的第 3 行，next_js() 方法是 NexT 主题内置的用来引入 js 的通用方法，该方法将 source/js/ 目录作为相对路径，所以上面的 custom/clock.js 其实就是主题目录中的 source/js/custom/clock.js 文件。

因粒子时钟的实现是用现代浏览器支持的 canvas 绘图实现的，在 IE 等浏览器上可能无法正常显示，这时，页面上就会显示当前浏览器不支持canvas，请更换浏览器后再试。

导入视图 {#导入视图}

至此，在页面上任意位置引入上面的 layout/_custom/clock.swig 文件即可实现粒子时钟了。比如放在页面的侧边栏，既美观又不影响网站的易用性。打开主题目录下的 layout/_macro/sidevar.swig 文件，找到 class 为 sidebar-inner 的 div 元素，在该元素中最后位置引入上面的 clock.swig 文件：

|---------------|---------------------------------------------------------------------------------------------| | 1 2 3 | {%- if theme.diy_clock.clock %} {%- include '../_custom/clock.swig' %} {%- endif %} |

当主题配置中的 diy_clock.clock 为 true 时，页面加载粒子时钟。