HTML5——监听手机的一些事件：手机加速度devicemotion、设备方向变化deviceorientation、手机摇一摇、指南针
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HTML5——监听手机的一些事件：手机加速度devicemotion、设备方向变化deviceorientation、手机摇一摇、指南针
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1. devicemotion：監聽手機加速度變化的事件（比如：手機瘋狂搖擺）
屬性：均為只讀屬性
（1）accelerationIncludingGravity：重力加速度（包括重心引力9.8）
（2）acceleration：加速度（需要設備陀螺儀支持）
（3）rotationRate（alpha，beat，gamma）；旋轉速度
（4）interval：獲取的時間間隔
搖一搖：
<!DOCTYPE html> <html lang="en"><head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>test</title><style>#redPacket{position: absolute;left: 50%;top: 50%;width: 300px;height: 400px;/* border: 1px solid black; */margin-top: -200px;margin-left: -150px;opacity: 0;}#tip{color: red;font-size: 40px;opacity: 1;}</style> </head><body><div id="tip">搖一搖得紅包</div><div id="redPacket"></div><script>var SHAKE_THRESHOLD = 800;var last_update = 0;var x, y, z, last_x=0, last_y=0, last_z=0;function deviceMotionHeadler(eventData){var acceleration = eventData.accelerationIncludingGravity;var curTime = new Date().getTime();if((curTime - last_update) > 300){var diffTime = curTime - last_update;last_update = curTime;x = acceleration.x;y = acceleration.y;z = acceleration.z;var speed = Math.abs(x + y + z -last_x -last_y -last_z)/ diffTime * 10000;if(speed > SHAKE_THRESHOLD){alert('恭喜你獲得紅包!');var div = document.getElementById('redPacket');var img = new Image();img.src = 'https://ss1.bdstatic.com/70cFvXSh_Q1YnxGkpoWK1HF6hhy/it/u=3378701361,2399708000&fm=27&gp=0.jpg';img.onload = function(){div.appendChild(img);img.style.width = '300px';img.style.height = '400px';tip.style.opacity = 0;div.style.opacity = 1;}}last_x = x;last_y = y;last_z = z;}} window.addEventListener('devicemotion', deviceMotionHeadler, false);</script> </body></html>理解：手機抖動的時間要大于300ms，防止用戶拿手機時，突然抖動而觸發搖一搖功能；速度要大于800，證明用戶是在快速搖手機。?
2. deviceOrientation：監聽設備在方向上的變化的事件
詳情：https://developer.mozilla.org/zh-CN/docs/Web/API/Detecting_device_orientation
屬性：
alpha：設備沿z軸方向的選轉，水平面上的選擇，范圍：-360~360
beta：設備沿x軸方向的旋轉，由前向后，范圍：-180~180
gamma：設備沿y軸方向的旋轉，由左向右，范圍：-90~90
webkitCompassHeading：與正北方向的角度差，正北方向為0，正南方向：180；范圍：0~360；（安卓手機沒有該方法）
<!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>Document</title> </head> <body><p>旋轉：<span id="alpha">0</span></p><p>前后：<span id="beta">0</span></p><p>扭轉：<span id="gamma">0</span></p><p>方向：<span id="heading">0</span></p><script>function DeviceOrientationHandler(event){var alpha = event.alpha,beta = event.beta,gamma = event.gamma,webkitCompassHeading = event.webkitCompassHeading;if(alpha != null || beta != null || gamma != null){//判斷屏幕方向var html = "";if( gamma > 0 ){html = "向右傾斜" + gamma;}else{html = "向左傾斜" + gamma;}document.getElementById("gamma").innerHTML = html;var str = '';if( beta > 0 ){str = "向前傾斜" + beta;}else{str = "向后傾斜" + beta;}var head = '';var headNum = Math.round(Math.round(webkitCompassHeading/45) + 7)%8;switch (headNum) {case 0:head = '東北';break;case 1:head = '東';break;case 2:head = '東南';break;case 3:head = '南';break;case 4:head = '西南';break;case 5:head = '西';break;case 6:head = '西北';break;case 7:head = '北';}document.getElementById("beta").innerHTML = str;document.getElementById("alpha").innerHTML = alpha;document.getElementById('heading').innerHTML = head + ' ' + webkitCompassHeading;}else{document.body.innerHTML = "當前瀏覽器不支持DeviceOrientation";}}if(window.DeviceOrientationEvent){window.addEventListener('deviceorientation',DeviceOrientationHandler, false);}else{alert("您的瀏覽器不支持DeviceOrientation");}</script> </body> </html>?
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指南針：
<!DOCTYPE html> <html lang="en"> <head><meta charset="UTF-8"><meta name="viewport" content="width=device-width, initial-scale=1.0"><meta http-equiv="X-UA-Compatible" content="ie=edge"><title>Document</title><style>*{padding: 0;margin: 0;list-style: none;}html{background: #333;color: #fff;}.box{position: relative;top: 100px;margin: 0 auto;width: 300px;height: 300px;/* border: 1px solid #fff; */}.pin{position: absolute;top: -50px;left: 50%;margin-left: -2px;width: 4px;height: 50px;background: #fff;}.ten{position: absolute;top: 50%;left: 50%;margin-left: -100px;margin-top: -100px;width: 200px;height: 200px;}.h, .l{position: absolute;top: 50%;left: 50%;transform: translate(-50%, -50%);background: #fff;}.ten .h{width: 2px;height: 200px;}.ten .l{width: 200px;height: 2px;}ul{width: 300px;height: 300px;border-radius: 50%;transition: all 10ms linear;}li{position: absolute;top: 0;left: 50%;margin-left: -1px;width: 2px;height: 20px;background: red;transform-origin: 1px 150px;}span{position: absolute;top: -20px;left: 50%;transform: translate(-50%, -50%);color: #fff;} </style> </head> <body><p>方向：<div id="heading">0</div></p> <div class="box"><div class="pin"></div> <div class="ten"><div class="l"></div><div class="h"></div></div><ul><li><span style="color:red">0</span></li><li><span>330</span></li><li><span>300</span></li><li><span>270</span></li><li><span>240</span></li><li><span>210</span></li><li><span>180</span></li><li><span>150</span></li><li><span>120</span></li><li><span>90</span></li><li><span>60</span></li><li><span>30</span></li></ul></div><script>function lineDraw() {var li = document.getElementsByTagName('li');var span = document.getElementsByTagName('span');var len = li.length;for(var i = 0; i < len; i++) { // span[i].style.transform = 'rotate('+ -30 * i+'deg)';li[i].style.transform = 'rotate('+30*i+'deg)';}}lineDraw();function move(ang) {var ul = document.getElementsByTagName('ul')[0];ul.style.transform= 'rotate('+ang+'deg)';}function DeviceOrientationHandler(event){var webkitCompassHeading = event.webkitCompassHeading;// if(webkitCompassHeading != null){//判斷屏幕方向var head = '';var headNum = Math.round(Math.round(webkitCompassHeading/45) + 7)%8;switch (headNum) {case 0:head = '東北';break;case 1:head = '東';break;case 2:head = '東南';break;case 3:head = '南';break;case 4:head = '西南';break;case 5:head = '西';break;case 6:head = '西北';break;case 7:head = '北';}move(webkitCompassHeading);document.getElementById('heading').innerHTML = head + ' ' + Math.round(webkitCompassHeading);// }else{// document.body.innerHTML = "當前瀏覽器不支持DeviceOrientation";// }}if(window.DeviceOrientationEvent){window.addEventListener('deviceorientation',DeviceOrientationHandler, false);}else{alert("您的瀏覽器不支持DeviceOrientation");} </script> </body> </html>?
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