wutt
/
game


			
				
					
						
						
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							<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <meta http-equiv="X-UA-Compatible" content="ie=edge">
  <title>摇一摇</title>
</head>
<body>
  <div>
    摇一摇
  </div>
  <script>
    const SHAKE_SPEED = 300;
    let lastTime = 0;//上次变化的时间
    let x = y = z = lastX = lastY = lastZ = 0;//位置变量初始化

    function  motionHandler(event) {
      let acceleration = event.accelerationIncludingGravity;
      let curTime = Date.now();//取得当前时间
      if ((curTime - lastTime) > 120) {
        let diffTime = curTime - lastTime;
        lastTime = curTime;
        x = acceleration.x;
        y = acceleration.y;
        z = acceleration.z;
        //计算摇动速度
        let speed = Math.abs(x + y + z - lastX - lastY - lastZ) / diffTime * 1000;
        if (speed > SHAKE_SPEED) {
          alert("你摇动了手机");
        }
        lastX = x;
        lastY = y;
        lastZ = z;
      }
    }
    if(window.DeviceMotionEvent) {
      window.addEventListener('devicemotion', motionHandler, false);
    } else {
      alert("你的设备不支持位置感应");
    }
  </script>
</body>
</html>