VRDisplayEvent.reason

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句法
范例
规范
浏览器兼容性
另请参阅
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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。

reason 只读特性在 VRDisplayEvent interface returns a human-readable reason why the event was fired.

句法

var myReason = vrDisplayEventInstance.reason;

值

A string representing the reason why the event was fired. The available reasons are defined in the VRDisplayEventReason enum, and are as follows:

mounted — VRDisplay has detected that the user has put it on (or it has been otherwise activated).
navigation — The page has been navigated to from a context that allows this page to begin presenting immediately, such as from another site that was already in VR presentation mode.
requested — The user agent has requested that VR presentation mode be started. This allows user agents to include a consistent UI to enter VR across different sites.
unmounted — VRDisplay has detected that the user has taken it off (or it has been otherwise slept/put on standby).

范例

window.addEventListener('vrdisplaypresentchange', function(e) {
  console.log('Display ' + e.display.displayId + ' presentation has changed. Reason given: ' + e.reason + '.');
})

规范

规范	状态	注释
WebVR 1.1 The definition of 'reason' in that specification.	草案	初始定义

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
`reason` 弃用	Chrome No	Edge 15 — 79	Firefox 55 55 Windows support was enabled in Firefox 55. 64 macOS support was enabled in Firefox 64.	IE No	Opera ?	Safari No	WebView Android No	Chrome Android 56 — 80 Disabled 不支持 56 — 80 Disabled Only works in an experimental version of Chrome . (Other builds won't return any devices when `Navigator.getVRDisplays()` is invoked.) Daydream View supported in Chrome 56. Google Cardboard supported in Chrome 57. Disabled From version 56 until version 80 (exclusive): this feature is behind the `WebVR` preference. To change preferences in Chrome, visit chrome://flags.	Firefox Android 55	Opera Android ?	Safari iOS ?	Samsung Internet Android 6.0 6.0 Google Cardboard supported in Samsung Internet 7.0.

图例

完整支持
不支持
兼容性未知 ?
实验。期望将来行为有所改变。
弃用。不要用于新网站。

用户必须明确启用此特征。

另请参阅

WebVR API homepage
MozVr.com — demos, downloads, and other resources from the Mozilla VR team.

元数据

最后修改： Aug 9, 2019

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句法

值

范例

规范

浏览器兼容性

图例

另请参阅

相关话题