Magnetometer - Web APIs 编辑

The Magnetometer interface of the Sensor APIs provides information about the magnetic field as detected by the device’s primary magnetometer sensor.

To use this sensor, the user must grant permission to the 'magnetometer' device sensor through the Permissions API.

If a feature policy blocks use of a feature, it's because your code is inconsistent with the policies set on your server. This is not something that would ever be shown to a user. See Feature-Policy for implementation instructions.

Constructor

Magnetometer.Magnetometer()

Creates a new Magnetometer object.

Properties

Magnetometer.x Read only

Returns a double containing the magnetic field around the device's x axis.

Magnetometer.y Read only

Returns a double containing the magnetic field around the device's y axis.

Magnetometer.z Read only

Returns a double containing the magnetic field around the device's z axis.

Example

The magnetometer is typically read in the Sensor.onreading event callback. In the example below this occurs sixty times a second.

let magSensor = new Magnetometer({frequency: 60});

magSensor.addEventListener('reading', e => {
  console.log("Magnetic field along the X-axis " + magSensor.x);
  console.log("Magnetic field along the Y-axis " + magSensor.y);
  console.log("Magnetic field along the Z-axis " + magSensor.z);
});
magSensor.start();

Specifications

Browser compatibility

BCD tables only load in the browser