如何通过html5实现摇一摇的功能-H5教程-PHP中文网

如何通过html5实现摇一摇的功能

jacklove

发布： 2018-06-09 10:04:08

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2825人浏览过

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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