如何通过html5实现摇一摇的功能

百变鹏仔 2个月前 (10-18) #H5教程

文章标签功能

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(&#39;mybody&#39;).className = &#39;doing&#39;;        document.getElementById(&#39;txt&#39;).innerHTML = &#39;执行了摇一摇&#39;;        setTimeout(function(){            doing=0;             document.getElementById(&#39;mybody&#39;).className=&#39;normal&#39;;            document.getElementById(&#39;txt&#39;).innerHTML = &#39;请执行摇一摇&#39;;        },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。

文章推荐

如何通过html5实现摇一摇的功能

HTML在线编辑器的调用方法和使用方法

AlloyTouch全屏滚动插件 30秒搞定顺滑H5页

HTML5 js实现拖拉上传文件功能

Canvas and Drawables 翻译第一集

Canvas and Drawables 翻译第三集