过时
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
Indicates the current battery charge level as a value between
0.0
and
1.0
.
var level = battery.level
On return,
level
is a number representing the system's battery charge level scaled to a value between 0.0 and 1.0. A value of 0 means the
battery
, which is a
BatteryManager
object, is empty and the system is about to be suspended. A value of 1.0 means the battery is full. A value of 1.0 is also returned if the implementation isn't able to determine the battery charge level or if the system is not battery-powered.
<div id="level">(battery level unknown)</div>
navigator.getBattery().then(function(battery) {
var level = battery.level;
document.querySelector('#level').textContent = level;
});
| 规范 | 状态 | 注释 |
|---|---|---|
| Battery Status API | 候选推荐 | 初始定义 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
level
弃用
|
Chrome 38 | Edge 79 |
Firefox
16 — 52
|
IE No | Opera 25 | Safari No | WebView Android 40 |
Chrome Android
38
|
Firefox Android
10 — 16
Prefixed
|
Opera Android 25 | Safari iOS ? — ? |
Samsung Internet Android
3.0
|
完整支持
不支持
弃用。不要用于新网站。
见实现注意事项。
用户必须明确启用此特征。
要求使用供应商前缀或不同名称。
BatteryManager