如何通过html5实现摇一摇的功能

互联网 18-6-9

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>

本文介绍了通过html5实现摇一摇的功能，更多相关内容请关注php中文网。

如何通过html5实现摇一摇的功能

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