my.startCompass

my.startCompass({
  success() {
    console.log('Compass started');
    my.onCompassChange((res) => {
      console.log('Heading:', res.direction);
    });
  }
});

Page({
  onLoad() {
    my.startCompass({
      success: () => {
        my.onCompassChange(this.updateCompass);
      },
      fail(err) {
        my.showToast({
          content: 'Compass not available',
          type: 'fail'
        });
      }
    });
  },

  updateCompass(res) {
    this.setData({
      heading: Math.round(res.direction),
      compassRotation: -res.direction
    });
  },

  onUnload() {
    my.offCompassChange(this.updateCompass);
  }
});

Page({
  async onLoad() {
    // Start compass for heading
    my.startCompass({
      success: () => {
        my.onCompassChange(this.updateHeading);
      }
    });

    // Get current location
    my.getLocation({
      success: (res) => {
        this.setData({
          latitude: res.latitude,
          longitude: res.longitude
        });
      }
    });
  },

  updateHeading(res) {
    this.setData({ heading: res.direction });
  }
});