在此页

• 句法
• 范例
• 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 .

keys() 方法在 XRInputSourceArray interface returns a JavaScript iterator which can then be used to iterate over the keys used to reference each item in the array of input sources.

句法

xrInputSourceArray.keys();
					

参数

None.

返回值

A JavaScript iterator that can be used to walk through the keys for each entry in the list of input sources. The values returned by the iterator are the indexes of each entry in the list; that is, the numbers 0, 1, 2, and so forth through the index of the last item in the list.

范例

This example snippet gets the list of inputs for a session and tries to handle each type of input device it supports using.

for (const inputIdx of xrSession.inputSources.keys()) {
  /* the keys are the indexes into the list of inputs */
  checkInput(xrSession.inputSources[inputIdx]);
}
					

这里， for...of is used to iterate over each of the keys. For each key, the input is retrieved using the index with array notation: xrSession.inputSources[inputIdx] .

规范

规范	状态	注释
WebXR 设备 API The definition of 'XRInputSourceArray' in that specification. 1	工作草案	XRInputSourceArray interface

[1] 见 Iterator-like methods in Information contained in a WebIDL file for information on how an iterable declaration in an interface definition causes entries() , forEach() , keys() ，和 values() methods to be exposed from objects that implement the interface.

浏览器兼容性

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
keys	Chrome 79	Edge 79	Firefox No	IE No	Opera No	Safari No	WebView Android No	Chrome Android 79	Firefox Android No	Opera Android No	Safari iOS No	Samsung Internet Android 11.2

图例

完整支持

完整支持

不支持

不支持

另请参阅

• Inputs and input sources
• XRInputSourceArray 方法 values()
• 数组 方法 keys( )
• XRInputSource

元数据

• 最后修改： Apr 7, 2020

相关话题

1. WebXR 设备 API
2. XRInputSourceArray
3. 特性

   1. length
4. 方法

   1. entries()
   2. forEach()
   3. keys()
   4. values()
5. Related pages for WebXR Device API

   1. Navigator.xr
   2. WebGLRenderingContext.makeXRCompatible()
   3. XR
   4. XRBoundedReferenceSpace
   5. XRFrame
   6. XRInputSource
   7. XRInputSourceEvent
   8. XRInputSourcesChangeEvent
   9. XRPose
   10. XRReferenceSpace
   11. XRReferenceSpaceEvent
   12. XRRenderState
   13. XRRigidTransform
   14. XRSession
   15. XRSessionEvent
   16. XRSpace
   17. XRView
   18. XRViewerPose
   19. XRViewport
   20. XRWebGLLayer