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‎21 - Geolocation/README.md

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# 21 Geolocation 中文指南
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> 本篇作者：©[大史快跑Dashrun](https://github.com/dashrun)——Chinasoft Frontend Developer
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> 简介：[JavaScript30](https://javascript30.com) 是 [Wes Bos](https://github.com/wesbos) 推出的一个 30 天挑战。项目免费提供了 30 个视频教程、30 个挑战的起始文档和 30 个挑战解决方案源代码。目的是帮助人们用纯 JavaScript 来写东西，不借助框架和库，也不使用编译器和引用。现在你看到的是这系列指南的第 21 篇。完整指南在 [GitHub](https://github.com/soyaine/JavaScript30)，喜欢请 Star 哦♪(^∇^*)
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> 创建时间：2017-09-08
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最后更新：2017-09-11
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## 挑战任务
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本次的挑战任务，是利用浏览器内置`Web Geolocation API`,将获取到的地理位置及相关坐标，与`index-start.html`中的可视化指南针连接在一起。
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## 实现效果
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![结果展示](https://github.com/dashrun/vanilla-javascript-30/blob/master/21%20-%20Geolocation/effects.png)
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由于笔记本电脑一般不带速度及方向传感器，从结果中可以看到返回值中`heading`及`speed`键值均为`null`,为演示可视化效果，代码中采用手动赋值的方式进行演示。
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## 相关知识
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1.有关地理位置接口`Geolocation`的说明，可查看[MDN](https://developer.mozilla.org/zh-CN/docs/Web/API/Geolocation)中的相关解释。
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2.`getCurrentPosition()`方法和`watchPosition()`方法
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`getCurrentPosition()`方法在调用时返回一次相关信息，`watchPosition()`方法调用后将持续返回相关信息，两个方法调用时除了传入相关的回调函数外，还需要传入`options`配置对象作为第三参数，`options`相关键值如下：
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- `enableHighAccuracy`参数表示是否高精度可用，为Boolean类型，默认为false，如果开启，响应时间会变慢，同时，在手机设备上会用掉更多的流量，也就是money了。
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- `timeout`参数表示等待响应的最大时间，默认是0毫秒，表示无穷时间。
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- `maximumAge`表示应用程序的缓存时间。单位毫秒，默认是0，意味着每次请求都是立即去获取一个全新的对象内容。
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## 过程指南
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1.使用`getCurrentPosition()`方法获得相关信息
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```js
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if(navigator.geolocation){
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navigator.geolocation.getCurrentPosition(success, error, options);
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}else{
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console.log('Your broswer does not support the Geolocation API');
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}
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```
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2.当成功返回结果时，在控制台输出结果，并根据结果对相应的DOM元素进行样式调整
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```js
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function success(pos) {
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console.log(pos);
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var crd = pos.coords;
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console.log('Your current position is:');
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console.log('Latitude : ' + crd.latitude);
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console.log('Longitude: ' + crd.longitude);
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console.log('More or less ' + crd.accuracy + ' meters.');
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//改变传感器速度值和罗盘的指向
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speed.innerHTML = crd.speed;
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arrow.style.transform = `rotate(${crd.heading}deg)`;
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};
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```
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‎21 - Geolocation/effects.png

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‎21 - Geolocation/index-finished-Dashrun.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Document</title>
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<meta name="viewport" content="width=device-width">
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</head>
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<body>
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<svg class="arrow" xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" version="1.1" x="0px" y="0px" viewBox="0 0 64 64" enable-background="new 0 0 64 64" xml:space="preserve"><g><path fill="#ffffff" d="M32,1.824C15.361,1.824,1.825,15.361,1.825,32c0,16.639,13.537,30.176,30.175,30.176 S62.175,48.639,62.175,32C62.175,15.361,48.639,1.824,32,1.824z M29.715,3.988h1.12l2.333,3.807V3.988h1.069v5.701h-1.155 l-2.298-3.718v3.718h-1.069V3.988z M9.323,33.917H8.102l-1.136-4.262l-1.132,4.262H4.587l-1.361-5.701h1.178l0.859,3.916 l1.042-3.916h1.369l0.999,3.982l0.875-3.982h1.159L9.323,33.917z M33.995,59.828c-0.181,0.285-0.438,0.497-0.77,0.636 c-0.332,0.139-0.745,0.208-1.241,0.208c-0.721,0-1.274-0.167-1.661-0.5c-0.386-0.333-0.617-0.819-0.692-1.456l1.12-0.109 c0.067,0.376,0.204,0.652,0.41,0.828c0.206,0.176,0.484,0.264,0.834,0.264c0.371,0,0.65-0.078,0.838-0.235 c0.188-0.157,0.282-0.34,0.282-0.55c0-0.135-0.04-0.25-0.119-0.344c-0.079-0.095-0.217-0.177-0.414-0.247 c-0.135-0.047-0.442-0.13-0.922-0.249c-0.617-0.153-1.05-0.341-1.299-0.564c-0.35-0.314-0.525-0.696-0.525-1.147 c0-0.29,0.082-0.562,0.247-0.815c0.165-0.253,0.402-0.445,0.712-0.577c0.31-0.132,0.684-0.198,1.122-0.198 c0.716,0,1.254,0.157,1.616,0.471c0.362,0.314,0.552,0.733,0.57,1.256l-1.151,0.051c-0.049-0.293-0.155-0.504-0.317-0.632 c-0.162-0.128-0.405-0.193-0.729-0.193c-0.334,0-0.596,0.069-0.786,0.206c-0.122,0.088-0.183,0.206-0.183,0.354 c0,0.135,0.057,0.25,0.171,0.346c0.145,0.122,0.498,0.249,1.058,0.381c0.56,0.132,0.974,0.269,1.243,0.41 c0.268,0.141,0.478,0.334,0.63,0.58c0.152,0.245,0.227,0.548,0.227,0.908C34.267,59.237,34.176,59.543,33.995,59.828z M32,52.795 c-11.466,0-20.795-9.329-20.795-20.795c0-11.466,9.329-20.795,20.795-20.795S52.795,20.534,52.795,32 C52.795,43.466,43.466,52.795,32,52.795z M55.014,33.917v-5.701h4.227v0.965h-3.076v1.264h2.862v0.96h-2.862v1.552h3.185v0.961 H55.014z"/><g><path fill="#000000" d="M48.904,31.863c-4.074-1.358-8.148-2.717-12.226-4.066c-0.265-0.087-0.399-0.223-0.486-0.486 c-1.349-4.077-2.708-8.151-4.066-12.226c-0.029-0.087-0.074-0.169-0.132-0.3c-0.054,0.152-0.09,0.245-0.122,0.34 c-1.352,4.053-2.707,8.104-4.048,12.161c-0.096,0.292-0.246,0.428-0.532,0.522c-4.056,1.342-8.108,2.696-12.16,4.049 c-0.097,0.032-0.189,0.074-0.344,0.137c0.172,0.06,0.267,0.093,0.362,0.125c4.074,1.358,8.148,2.717,12.224,4.072 c0.204,0.068,0.337,0.158,0.412,0.386c1.243,3.757,2.498,7.511,3.75,11.265c0.144,0.432,0.291,0.862,0.463,1.373 c0.068-0.185,0.108-0.285,0.142-0.386c1.349-4.042,2.701-8.083,4.04-12.128c0.094-0.284,0.231-0.438,0.523-0.534 c4.056-1.341,8.108-2.696,12.161-4.048c0.099-0.033,0.195-0.076,0.347-0.137C49.067,31.925,48.987,31.891,48.904,31.863z M37.475,32.038c-1.316,0.439-2.631,0.879-3.947,1.314c-0.095,0.031-0.139,0.081-0.17,0.173c-0.434,1.313-0.873,2.625-1.311,3.937 c-0.012,0.033-0.024,0.066-0.046,0.126c-0.056-0.166-0.104-0.306-0.15-0.446c-0.407-1.219-0.814-2.437-1.218-3.657 c-0.025-0.074-0.068-0.104-0.134-0.125c-1.323-0.44-2.646-0.881-3.968-1.322c-0.031-0.01-0.062-0.022-0.118-0.041 c0.05-0.02,0.081-0.034,0.112-0.045c1.315-0.439,2.631-0.879,3.947-1.314c0.093-0.03,0.142-0.075,0.173-0.17 c0.435-1.316,0.875-2.632,1.314-3.947c0.01-0.031,0.022-0.062,0.039-0.11c0.019,0.042,0.033,0.069,0.043,0.097 c0.441,1.323,0.882,2.645,1.321,3.969c0.028,0.085,0.072,0.129,0.158,0.158c1.324,0.438,2.646,0.879,3.969,1.32 c0.027,0.009,0.053,0.02,0.1,0.038C37.538,32.013,37.507,32.027,37.475,32.038z"/><path fill="#000000" d="M24.436,27.633c-1.069-2.137-2.119-4.237-3.216-6.43c2.189,1.094,4.292,2.145,6.433,3.216 c-0.359,0.713-0.706,1.404-1.057,2.091c-0.023,0.045-0.078,0.082-0.127,0.106C25.807,26.949,25.143,27.28,24.436,27.633z"/><path fill="#000000" d="M39.573,27.632c-0.696-0.348-1.351-0.673-2.002-1.005c-0.076-0.038-0.155-0.104-0.193-0.177 c-0.338-0.661-0.666-1.326-1.019-2.033c2.121-1.061,4.228-2.115,6.43-3.217C41.69,23.399,40.635,25.509,39.573,27.632z"/><path fill="#000000" d="M24.436,36.339c0.712,0.357,1.394,0.698,2.074,1.043c0.046,0.024,0.088,0.073,0.113,0.121 c0.339,0.671,0.674,1.345,1.028,2.051c-2.126,1.063-4.232,2.117-6.43,3.216C22.317,40.577,23.37,38.472,24.436,36.339z"/><path fill="#000000" d="M36.358,39.555c0.354-0.707,0.688-1.38,1.028-2.05c0.028-0.056,0.084-0.111,0.14-0.139 c0.67-0.339,1.343-0.674,2.047-1.026c1.066,2.131,2.118,4.235,3.215,6.43C40.601,41.676,38.503,40.628,36.358,39.555z"/></g></g></svg>
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<h1 class="speed">
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<span class="speed-value">0</span>
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<span class="units">KM/H</span>
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</h1>
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<style>
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html {
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font-size: 100px;
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}
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body {
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margin: 0;
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font-family: sans-serif;
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min-height:100vh;
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display:flex;
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justify-content: center;
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align-items: center;
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flex-direction: column;
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background:
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radial-gradient(black 15%, transparent 16%) 0 0,
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radial-gradient(black 15%, transparent 16%) 8px 8px,
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radial-gradient(rgba(255,255,255,.1) 15%, transparent 20%) 0 1px,
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radial-gradient(rgba(255,255,255,.1) 15%, transparent 20%) 8px 9px;
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background-color:#282828;
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background-size:16px 16px;
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background-attachment: fixed;
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}
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.arrow {
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width:250px;
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overflow: hidden;
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transition: all 0.2s;
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transform:rotate(0deg);
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display: inline-block;
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}
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h1 {
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color:white;
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font-weight: 100;
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font-size: 60px;
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display:flex;
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align-items: center;
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}
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.units {
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font-size: 15px;
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}
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/*Compass: https://thenounproject.com/search/?q=compass&i=592352*/
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</style>
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<script>
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const arrow = document.querySelector('.arrow');
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const speed = document.querySelector('.speed-value');
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//geolocation方法设置参数
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const options = {
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enableHighAccuracy: false,
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timeout: 70000,
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maximumAge: 0
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};
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function success(pos) {
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console.log(pos);
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var crd = pos.coords;
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console.log('Your current position is:');
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console.log('Latitude : ' + crd.latitude);
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console.log('Longitude: ' + crd.longitude);
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console.log('More or less ' + crd.accuracy + ' meters.');
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//改变传感器速度值和罗盘的指向
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speed.innerHTML = crd.speed;
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arrow.style.transform = `rotate(${crd.heading}deg)`;
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//手动赋值演示可视化结果
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speed.innerHTML = 12;
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arrow.style.transform = `rotate(30deg)`;
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};
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function error(err) {
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console.warn('ERROR(' + err.code + '): ' + err.message);
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};
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if(navigator.geolocation){
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navigator.geolocation.getCurrentPosition(success, error, options);
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}else{
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console.log('Your broswer does not support the Geolocation API');
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}
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</script>
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</body>
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</html>

‎21 - Geolocation/index-start.html

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<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="UTF-8">
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<title>Document</title>
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<meta name="viewport" content="width=device-width">
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</head>
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<body>
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<h1 class="speed">
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<span class="speed-value">0</span>
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<span class="units">KM/H</span>
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<style>
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html {
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font-size: 100px;
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}
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body {
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margin: 0;
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font-family: sans-serif;
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min-height:100vh;
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display:flex;
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justify-content: center;
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align-items: center;
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flex-direction: column;
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background:
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radial-gradient(black 15%, transparent 16%) 0 0,
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radial-gradient(black 15%, transparent 16%) 8px 8px,
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radial-gradient(rgba(255,255,255,.1) 15%, transparent 20%) 0 1px,
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radial-gradient(rgba(255,255,255,.1) 15%, transparent 20%) 8px 9px;
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background-color:#282828;
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background-size:16px 16px;
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background-attachment: fixed;
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}
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.arrow {
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width:250px;
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overflow: hidden;
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transition: all 0.2s;
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transform:rotate(0deg);
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display: inline-block;
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}
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h1 {
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color:white;
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font-weight: 100;
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font-size: 60px;
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display:flex;
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align-items: center;
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}
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.units {
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font-size: 15px;
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}
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/*Compass: https://thenounproject.com/search/?q=compass&i=592352*/
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</style>
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<script>
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</script>
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</html>

‎README.md

Lines changed: 2 additions & 2 deletions
Original file line numberDiff line numberDiff line change
@@ -59,7 +59,7 @@ No | Guide | Demo
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17 | [Sort Without Articles 指南](https://github.com/soyaine/JavaScript30/blob/master/17%20-%20Sort%20Without%20Articles/README.md) | [去前缀排序在线效果](https://soyaine.github.io/JavaScript30/17%20-%20Sort%20Without%20Articles/index-finished-Dashrun-es5.html)
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18 | [Adding Up Times with Reduce 指南](https://github.com/soyaine/JavaScript30/tree/master/18%20-%20AddingUpTimesWithReduce) | [使用 Reduce 进行时间叠加效果](https://soyaine.github.io/JavaScript30/18%20-%20AddingUpTimesWithReduce/index-finished-Dashrun-es6.html)
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19 | [Webcam Fun 指南](https://github.com/soyaine/JavaScript30/blob/master/19%20-%20Webcam%20Fun/README.md) | [网络摄像头及图片处理在线效果](https://github.com/soyaine/JavaScript30/blob/master/19%20-%20Webcam%20Fun/index-finished-Dashrun.html)
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20 | Speech Detection | -
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20 | [Speech Detection指南](https://github.com/soyaine/JavaScript30/blob/master/20%20-%20Speech%20Detection/README.md) | [Speech Detection效果](https://github.com/soyaine/JavaScript30/blob/master/20%20-%20Speech%20Detection/index-finished-Dashrun.html)
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21 | Geolocation | -
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22 | Follow Along Link Highlighter | -
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23 | Speech Synthesis | -
@@ -80,7 +80,7 @@ Name | Contribution
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[@DrakeXiang](https://github.com/DrakeXiang) | No.[11](https://github.com/soyaine/JavaScript30/tree/master/11%20-%20Custom%20Video%20Player)
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[@zzh466](http://github.com/zzh466) | Review
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[@Xing Liu](https://github.com/S1ngS1ng) | Review
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[@大史快跑Dashrun](https://github.com/dashrun) | No.[16](https://github.com/soyaine/JavaScript30/tree/master/16%20-%20Mouse%20Move%20Shadow).[17](https://github.com/soyaine/JavaScript30/tree/master/17%20-%20Sort%20Without%20Articles).[18](https://github.com/soyaine/JavaScript30/tree/master/18%20-%20AddingUpTimesWithReduce).[19](https://github.com/soyaine/JavaScript30/blob/master/19%20-%20Webcam%20Fun)
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[@大史快跑Dashrun](https://github.com/dashrun) | No.[16](https://github.com/soyaine/JavaScript30/tree/master/16%20-%20Mouse%20Move%20Shadow).[17](https://github.com/soyaine/JavaScript30/tree/master/17%20-%20Sort%20Without%20Articles).[18](https://github.com/soyaine/JavaScript30/tree/master/18%20-%20AddingUpTimesWithReduce).[19](https://github.com/soyaine/JavaScript30/blob/master/19%20-%20Webcam%20Fun).[20](https://github.com/soyaine/JavaScript30/tree/master/20%20-%20Speech%20Detection)
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[@缉熙Soyaine](https://github.com/soyaine) | No.[1](https://github.com/soyaine/JavaScript30/tree/master/01%20-%20JavaScript%20Drum%20Kit).[2](https://github.com/soyaine/JavaScript30/tree/master/02%20-%20JS%20%2B%20CSS%20Clock).[3](https://github.com/soyaine/JavaScript30/tree/master/03%20-%20CSS%20%Variables).[4](https://github.com/soyaine/JavaScript30/tree/master/04%20-%20Array%20Cardio%20Day%201).[5](https://github.com/soyaine/JavaScript30/blob/master/05%20-%20Flex%20Panel%20Gallery).[6](https://github.com/soyaine/JavaScript30/blob/master/06%20-%20Type%20Ahead).[7](https://github.com/soyaine/JavaScript30/tree/master/07%20-%20Array%20Cardio%20Day%202).[8](https://github.com/soyaine/JavaScript30/tree/master/08%20-%20Fun%20with%20HTML5%20Canvas).[9](https://github.com/soyaine/JavaScript30/blob/master/09%20-%20Dev%20Tools%20Domination).[10](https://github.com/soyaine/JavaScript30/blob/master/10%20-%20Hold%20Shift%20and%20Check%20Checkboxes/README.md).[12](https://github.com/soyaine/JavaScript30/tree/master/12%20-%20Key%20Sequence%20Detection/README.md).[13](https://github.com/soyaine/JavaScript30/blob/master/13%20-%20Slide%20in%20on%20Scroll/README.md).[14](https://github.com/soyaine/JavaScript30/tree/master/14%20-%20JavaScript%20References%20VS%20Copying)
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## JOIN US

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