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。

canPresent 只读特性在 VRDisplayCapabilities interface returns a 布尔 stating whether the VR display is capable of presenting content (e.g. through an HMD).

This is useful for identifying "magic window" devices that are capable of 6DoF tracking but for which VRDisplay.requestPresent() is not meaningful. If canPresent is false ,调用 VRDisplay.requestPresent() will fail, and VRDisplay.getEyeParameters() 将返回 null .

句法

var canIPresent = vrDisplayCapabilitiesInstance.canPresent;
					

A 布尔 .

范例

function reportDisplays() {
  navigator.getVRDisplays().then(function(displays) {
    for(var i = 0; i < displays.length; i++) {
      var cap = displays[i].capabilities;
      // cap is a VRDisplayCapabilities object
      var listItem = document.createElement('li');
      listItem.innerHTML = '<strong>Display ' + (i+1) + '</strong>'
                   + '<br>VR Display ID: ' + displays[i].displayId
                   + '<br>VR Display Name: ' + displays[i].displayName
                   + '<br>Display can present content: ' + cap.canPresent
                   + '<br>Display is separate from the computer\'s main display: ' + cap.hasExternalDisplay
                   + '<br>Display can return position info: ' + cap.hasPosition
                   + '<br>Display can return orientation info: ' + cap.hasOrientation
                   + '<br>Display max layers: ' + cap.maxLayers;
      list.appendChild(listItem);
    }
  });
}
					

规范

规范 状态 注释
WebVR 1.1
The definition of 'canPresent' 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
canPresent 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 ? 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

完整支持

不支持

不支持

兼容性未知 ?

兼容性未知

实验。期望将来行为有所改变。

实验。期望将来行为有所改变。

弃用。不要用于新网站。

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。

用户必须明确启用此特征。

另请参阅

元数据

  • 最后修改:
  1. WebVR API
  2. VRDisplayCapabilities
  3. 特性
    1. canPresent
    2. hasExternalDisplay
    3. hasOrientation
    4. hasPosition
    5. maxLayers
  4. Related pages for WebVR API
    1. Gamepad.displayId
    2. Navigator.activeVRDisplays
    3. Navigator.getVRDisplays()
    4. VRDisplay
    5. VRDisplayEvent
    6. VREyeParameters
    7. VRFieldOfView
    8. VRFrameData
    9. VRLayerInit
    10. VRPose
    11. VRStageParameters

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