grav html5,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：

html5使用DeviceMotionEvent实现摇一摇

.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;}

请执行摇一摇

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);

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。

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