バッテリー状態 API

navigator.getBattery().then((battery) => {
  function updateAllBatteryInfo() {
    updateChargeInfo();
    updateLevelInfo();
    updateChargingInfo();
    updateDischargingInfo();
  }
  updateAllBatteryInfo();

  battery.addEventListener("chargingchange", () => {
    updateChargeInfo();
  });
  function updateChargeInfo() {
    console.log(`Battery charging? ${battery.charging ? "Yes" : "No"}`);
  }

  battery.addEventListener("levelchange", () => {
    updateLevelInfo();
  });
  function updateLevelInfo() {
    console.log(`Battery level: ${battery.level * 100}%`);
  }

  battery.addEventListener("chargingtimechange", () => {
    updateChargingInfo();
  });
  function updateChargingInfo() {
    console.log(`Battery charging time: ${battery.chargingTime} seconds`);
  }

  battery.addEventListener("dischargingtimechange", () => {
    updateDischargingInfo();
  });
  function updateDischargingInfo() {
    console.log(`Battery discharging time: ${battery.dischargingTime} seconds`);
  }
});