JavaScript 摇一摇

function handleMotionEvent() {
  const speed = 4500;
  let count = 0;
  let startTime = new Date().getTime();
  let startAcceleration = {
    x: 0,
    y: 0,
    z: 0,
  };

  const handle = function(DeviceMotionEvent) {
    const endTime = new Date().getTime();
    const endAcceleration = DeviceMotionEvent.accelerationIncludingGravity;
    const time = endTime - startTime;

    if (time > 100) {
      const distance = Math.sqrt(
        Math.pow(endAcceleration.x - startAcceleration.x, 2) +
          Math.pow(endAcceleration.y - startAcceleration.y, 2) +
          Math.pow(endAcceleration.z - startAcceleration.z, 2)
      );
      startTime = endTime;
      // console.log('Speed: ', Math.round((distance / time) * 10000));
      if ((distance / time) * 10000 > speed) {
        console.log('【Times】', count++);
      }
      startAcceleration = endAcceleration;
    }
    // window.removeEventListener('devicemotion', handle, false);
  };

  return handle;
}

if (window.DeviceOrientationEvent) {
  const handle = handleMotionEvent();
  window.addEventListener('devicemotion', handle, false);
}