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：
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