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利用HTML5的devicemotion事件实现手机摇一摇抽奖,年会抽奖

时间:2021-07-01 10:21:17 帮助过:31人阅读

摇一摇JS脚本逻辑:
接下来是移动端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,该事件的基本使用如下:

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.');
}

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。该API的具体使用大家可以参考网上的资料,非常多,这里就不重复了。 摇一摇的具体逻辑如下:

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;
}

不考虑各等奖的中奖概率问题

最终完整代码示例:

<!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.html

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