在此页

• 句法
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

安全上下文
此特征只可用于 安全上下文 (HTTPS)，在某些或所有 支持浏览器 .

这是 实验性技术
检查 浏览器兼容性表格 要小心谨慎在生产中使用这之前。

onavailabilitychanged 特性为 蓝牙 interface is an EventHandler 处理 availabilitychanged events that fire when the Bluetooth system as a whole becomes available or unavailable to the User Agent .

句法

Bluetooth.onavailabilitychanged = functionRef;
					

值

functionRef is the handler function to be called when the Bluetooth availabilitychanged 事件激发。

规范

规范	状态	注释
Web Bluetooth The definition of 'Bluetooth' in that specification.	草案	初始定义。

浏览器兼容性

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request. 更新 GitHub 上的兼容性数据

	桌面						移动
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
onavailabilitychanged	Chrome 56 56 macOS only. 56 Disabled Linux and versions of Windows earlier than 10. Disabled From version 56: this feature is behind the #enable-experimental-web-platform-features preference (needs to be set to enabled ). To change preferences in Chrome, visit chrome://flags. 70 Windows 10.	Edge ≤79 ≤79 macOS only. ≤79 Disabled Linux and versions of Windows earlier than 10. Disabled From version ≤79: this feature is behind the #enable-experimental-web-platform-features preference (needs to be set to enabled ). ≤79 Windows 10.	Firefox No	IE No	Opera 43 43 macOS only. 43 Disabled Linux and versions of Windows earlier than 10. Disabled From version 43: this feature is behind the #enable-experimental-web-platform-features preference (needs to be set to enabled ). 57 Windows 10.	Safari No	WebView Android No	Chrome Android 56	Firefox Android No	Opera Android 43	Safari iOS No	Samsung Internet Android 6.0

图例

完整支持

完整支持

不支持

不支持

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

见实现注意事项。

用户必须明确启用此特征。

用户必须明确启用此特征。

另请参阅

• Bluetooth.getAvailability

元数据

• 最后修改： Apr 4, 2020

相关话题

1. Web Bluetooth API
2. 蓝牙
3. 方法

   1. requestDevice()
4. Related pages for Bluetooth API

   1. BluetoothAdvertisingData
   2. BluetoothDevice
   3. BluetoothGATTCharacteristic
   4. BluetoothGATTDescriptor
   5. BluetoothGATTRemoteServer
   6. BluetoothGATTService