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Use the devicemotion event of HTML5 to realize the lottery by shaking the mobile phone and the lottery at the annual meeting
- 高洛峰Original
- 2017-02-09 15:43:401718browse
Shake the JS script logic:
The next step is the implementation of the mobile JS script logic. The implementation of the shake requires the use of the new devicemotion event in HTML5 to obtain the change speed of the device in position and direction. Information, the basic usage of this event is as follows:
if (window.DeviceMotionEvent) {
window.addEventListener('devicemotion', handler, !1);
lastTime = new Date();
} else {
alert('你的浏览器不支持摇一摇功能.');
}The devicemotion event object has an accelerationIncludingGravity attribute, which includes: an object containing x, y and z attributes, taking into account the natural gravity acceleration of the z-axis , tells you the acceleration in each direction. For the specific use of this API, you can refer to the information on the Internet. There are many, so I will not repeat them here. The specific logic of shaking is as follows:
function handler(e) {
var current = e.accelerationIncludingGravity;
var currentTime;
var timeDifference;
var deltaX = 0;
var deltaY = 0;
var deltaZ = 0;
//记录上一次设备在x,y,z方向上的加速度
if ((lastX === null) && (lastY === null) && (lastZ === null)) {
lastX = current.x;
lastY = current.y;
lastZ = current.z;
return;
}
//得到两次移动各个方向上的加速度绝对差距
deltaX = Math.abs(lastX - current.x);
deltaY = Math.abs(lastY - current.y);
deltaZ = Math.abs(lastZ - current.z);
//当差距大于设定的阀值并且时间间隔大于指定阀值时，触发摇一摇逻辑
if (((deltaX > threshold) && (deltaY > threshold)) || ((deltaX > threshold) && (deltaZ > threshold)) || ((deltaY > threshold) && (deltaZ > threshold))) {
currentTime = new Date;
timeDifference = currentTime.getTime() - lastTime.getTime();
//时间间隔
if (timeDifference > timeout) {
//触发摇一摇事件
dealShake();
lastTime = new Date;
}
}
lastX = current.x;
lastY = current.y;
lastZ = current.z;
}Does not consider the winning probability of each prize
Final complete code example:
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0,minimum-scale=1.0,user-scalable=no">
<title>摇一摇抽奖</title>
<style type="text/css">
html,body{ width:100%; height:100%; background-color: #000; margin:0; overflow: hidden;}
.tip{ position: absolute; bottom: 30px; left: 10px; color: #fff; font-family: '楷体'; text-align: center; right: 10px; height: 32px; line-height: 32px; background-color: rgba(255,255,255,.4); border-radius: 3px; } .tip.active{ -webkit-animation: jump 1.5s linear; animation: jump 1s linear; }
</style>
</head>
<body>
<div class="tip" id="tip"> </div>
<script type="text/javascript">
var lastX = null,
lastY = null,
lastZ = null;
var threshold = 3; //灵敏度（值越小灵敏度越高）
var timeout = 1000;
var lastTime = null;
var isShaking = !1;
document.addEventListener('DOMContentLoaded', function (e) {
ready();
}, !1);
/*脚本逻辑：
*移动端JS脚本逻辑的实现，摇一摇的实现需借助html5新增的devicemotion事件，获取设备在位置和方向上的改变速度的相关信息。
*devicemotion事件对象中有一个accelerationIncludingGravity属性，该属性包括：一个包含x、y 和z 属性的对象，在考虑z 轴自然重力加速度的情况下，告诉你在每个方向上的加速度。
*/
function ready() {
if (window.DeviceMotionEvent) {
window.addEventListener('devicemotion', handler, !1);
lastTime = new Date();
} else {
alert('你的浏览器不支持摇一摇功能.');
}
}
function handler(e) {
var current = e.accelerationIncludingGravity;
var currentTime;
var timeDifference;
var deltaX = 0;
var deltaY = 0;
var deltaZ = 0;
//记录上一次设备在x,y,z方向上的加速度
if ((lastX === null) && (lastY === null) && (lastZ === null)) {
lastX = current.x;
lastY = current.y;
lastZ = current.z;
return;
}
//得到两次移动各个方向上的加速度绝对差距
deltaX = Math.abs(lastX - current.x);
deltaY = Math.abs(lastY - current.y);
deltaZ = Math.abs(lastZ - current.z);
//当差距大于设定的阀值并且时间间隔大于指定阀值时，触发摇一摇逻辑
if (((deltaX > threshold) && (deltaY > threshold)) || ((deltaX > threshold) && (deltaZ > threshold)) || ((deltaY > threshold) && (deltaZ > threshold))) {
currentTime = new Date;
timeDifference = currentTime.getTime() - lastTime.getTime();
//时间间隔
if (timeDifference > timeout) {
//触发摇一摇事件
dealShake();
lastTime = new Date;
}
}
lastX = current.x;
lastY = current.y;
lastZ = current.z;
}
function dealShake() {
if (isShaking) return;
isShaking = !0;
document.getElementById("tip").innerHTML = "恭喜您，摇中：" + GetName();
setTimeout(function () {
isShaking = !1;
document.getElementById("tip").innerHTML = " ";
}, 1000);
}
function GetName() {
var chars = ["一等奖", "二等奖", "三等奖", "四等奖", "五等奖"];
return chars[GetRandom(0, chars.length - 1)];
}
function GetRandom(minValue, maxValue) {
return Math.round(Math.random() * (maxValue - minValue)) + minValue;
}
</script>
</body>
shake.htmlMore implementation of devicemotion events using HTML5 Shake your mobile phone to draw a lottery. For articles related to the annual meeting lottery, please pay attention to the PHP Chinese website!