摇一摇变背景色

<script type="text/javascript">

var color = new Array('#fff', '#ff0', '#f00', '#000', '#00f', '#0ff');

if(window.DeviceMotionEvent) {

var speed = 25;

var x = y = z = lastX = lastY = lastZ = 0;

window.addEventListener('devicemotion', function(){

var acceleration =event.accelerationIncludingGravity;

x = acceleration.x;

y = acceleration.y;

if(Math.abs(x-lastX) > speed || Math.abs(y-lastY) > speed) {

document.body.style.backgroundColor = color[Math.round(Math.random()*10)%6];

}

lastX = x;

lastY = y;

}, false);

}

</script>