在此页

• 句法
• 范例
• 浏览器兼容性
• 另请参阅
• 相关话题

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This feature is obsolete.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.

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。

getState() 方法在 PositionSensorVRDevice interface returns the current state of the position sensor for the current frame (e.g. within the current window.requestAnimationFrame callback) or for the previous frame, contained with a VRPositionState object. This is the method you'd normally want to use, vs. PositionSensorVRDevice.getImmediateState .

句法

var myPositionState = PositionSensorVRDevice.getState();
					

参数

None.

返回

A VRPositionState 对象。

范例

The following example is taken from our positionsensorvrdevice demo, which uses the WebVR API to update the view of a simple 2D canvas scene on each frame of a requestAnimationFrame 循环。

function setView() {
  var posState = gPositionSensor.getState();
  if(posState.hasPosition) {
    posPara.textContent = 'Position: x' + roundToTwo(posState.position.x) + " y"
                                + roundToTwo(posState.position.y) + " z"
                                + roundToTwo(posState.position.z);
    xPos = -posState.position.x * WIDTH * 2;
    yPos = posState.position.y * HEIGHT * 2;
    if(-posState.position.z > 0.01) {
      zPos = -posState.position.z;
    } else {
      zPos = 0.01;
    }
  }
  if(posState.hasOrientation) {
    orientPara.textContent = 'Orientation: x' + roundToTwo(posState.orientation.x) + " y"
                                + roundToTwo(posState.orientation.y) + " z"
                                + roundToTwo(posState.orientation.z);
    xOrient = posState.orientation.x * WIDTH;
    yOrient = -posState.orientation.y * HEIGHT * 2;
    zOrient = posState.orientation.z * 180;
  }
}
					

Here we are grabbing a VRPositionState 对象使用 getState() and storing it in posState . We then check to make sure that position and orientation info is present in the current frame using VRPositionState.hasPosition and VRPositionState.hasOrientation (these return null if, for example the head mounted display is turned off or not pointing at the position sensor, which would cause an error.)

We then output the x, y and z position and orientation values for informational purposes, and use those values to update the xPos , yPos , zPos, xOrient , yOrient ，和 zOrient variables, which are used to update the scene rendering on each frame.

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
getState 弃用 非标	Chrome Yes Yes The support in Chrome is currently experimental. To find information on Chrome's WebVR implementation status including supporting builds, check out Bringing VR to Chrome by Brandon Jones.	Edge 79 79 The support in Edge is currently experimental. To find information on Edge's WebVR implementation status including supporting builds, check out Bringing VR to Edge by Brandon Jones.	Firefox 39 Disabled 39 Disabled The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config.	IE No	Opera No	Safari No	WebView Android No	Chrome Android No	Firefox Android 39 Disabled 39 Disabled The support for this feature is currently disabled by default in Firefox. To enable WebVR support in Firefox Nightly/Developer Edition, you can go to about:config and enable the dom.vr* prefs. A better option however is to install the WebVR Enabler Add-on , which does this for you and sets up other necessary parts of the environment . Disabled From version 39: this feature is behind the dom.vr* preference. To change preferences in Firefox, visit about:config. 44 dom.vr* prefs are enabled by default at this point, in Nightly/Aurora editions.	Opera Android No	Safari iOS No	Samsung Internet Android No

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。

非标。预期跨浏览器支持较差。

非标。预期跨浏览器支持较差。

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

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

元数据

• 最后修改： Dec 23, 2019

相关话题

1. WebVR API
2. PositionSensorVRDevice
3. 方法

   1. getImmediateState()
   2. getState()
   3. resetSensor()
4. 继承：

   1. VRDevice
5. Related pages for WebVR API

   1. Gamepad.displayId
   2. Navigator.activeVRDisplays
   3. Navigator.getVRDisplays()
   4. VRDisplay
   5. VRDisplayCapabilities
   6. VRDisplayEvent
   7. VREyeParameters
   8. VRFieldOfView
   9. VRFrameData
   10. VRLayerInit
   11. VRPose
   12. VRStageParameters