如何通过html5实现摇一摇的功能-9543建站博客

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如何通过html5实现摇一摇的功能

原理：使用DeviceMotion实现，关于DeviceMotion介绍可以查看 https://developer.mozilla.org/en-US/docs/Web/Reference/Events/devicemotion

通过DeviceMotionEvent，可以获得accelerationIncludingGravity的x,y,z属性，根据x,y,z属性的变化来判断设备是否有摇一摇的事件发生。

accelerationIncludeingGravity说明： The acceleration of the device. This value includes the effect of gravity, and may be the only value available on devices that don’t have a gyroscope to allow them to properly remove gravity from the data.

代码如下：

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"><html> <head>  <meta http-equiv="content-type" content="text/html;charset=utf-8">      <title> html5使用DeviceMotionEvent实现摇一摇 </title>  <style type="text/css">  .center{position:absolute; width:640px; height:480px; left:50%; top:50%; margin-left:-320px; margin-top:-240px; line-height:480px; text-align:center; font-size:100px; }  .normal{background:#000000;}  .normal .txt{color:#FFFFFF;}  .doing{background:#FF0000;}  .doing .txt{color:#FFFF00;}  </style> </head> <body id="mybody" class="normal">    <p id="txt" class="txt center">请执行摇一摇</p> </body> <script type="text/javascript">    var doing = 0;  // 判断是否在动画显示中    var speed = 23; // 定义摇动的速度数值    var lastx = 0;    var lasty = 0;    var lastz = 0;    function handleMotionEvent(event) {        var x = event.accelerationIncludingGravity.x;        var y = event.accelerationIncludingGravity.y;        var z = event.accelerationIncludingGravity.z;        if(doing==0){            if(Math.abs(x-lastx)>speed || Math.abs(y-lasty)>speed){                doing = 1;                show();            }        }        lastx = x;        lasty = y;        lastz = z;    }    function show(){        document.getElementById('mybody').className = 'doing';        document.getElementById('txt').innerHTML = '执行了摇一摇';        setTimeout(function(){            doing=0;             document.getElementById('mybody').className='normal';            document.getElementById('txt').innerHTML = '请执行摇一摇';        },3000);    }    window.addEventListener("devicemotion", handleMotionEvent, true); </script></html>

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