js控制电池

1. 判断设备是否在充电

   navigator.getBattery().then(function(battery){    if(battery.charging) {        alert("电池正在充电");    }else {        alert("电池没有充电");    }})

2. 获取设备电量

   navigator.getBattery().then(function(battery){    alert("电池电量" + battery.level * 100 + "%");})

3. 电池状态监听器

   navigator.getBattery().then(function(battery){    battery.addEventListener("chargingchange", function() {        console.log("电池状态：", battery.charging);    })    battery.addEventListener("levelchange", function() {        console.log("电池电量：", battery.level * 100 + "%");    })    battery.addEventListener("chargingtimechange", function() {        console.log("电池充满还需：", battery.chargingTime + "秒");    })    battery.addEventListener("dischargingtimechange", function() {        console.log("电池电量还能支撑：", battery.dischargingTime + "秒");    })})