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。
timestamp
只读特性在
VRFrameData
interface returns a constantly increasing timestamp value representing the time a frame update occurred.
Timestamps are useful for determining if position state data has been updated from the hardware. Since values are monotonically increasing, they can be compared to determine the ordering of updates — newer values will always be greater than or equal to older values.
The timestamp starts at 0 the first time
VRDisplay.getFrameData()
is invoked for a given
VRDisplay
.
var myTimestamp = vrFrameDataInstance.timestamp;
A
DOMHighResTimeStamp
对象。
var frameData = new VRFrameData();
var vrDisplay;
navigator.getVRDisplays().then(function(displays) {
vrDisplay = displays[0];
console.log('Display found');
// Starting the presentation when the button is clicked: It can only be called in response to a user gesture
btn.addEventListener('click', function() {
vrDisplay.requestPresent([{ source: canvas }]).then(function() {
drawVRScene();
});
});
});
// WebVR: Draw the scene for the WebVR display.
function drawVRScene() {
// WebVR: Request the next frame of the animation
vrSceneFrame = vrDisplay.requestAnimationFrame(drawVRScene);
// Populate frameData with the data of the next frame to display
vrDisplay.getFrameData(frameData);
// grab the current timestamp on each run of the rendering loop
// and do something with it
framedata.timestamp
...
// WebVR: Indicates that we are ready to present the rendered frame to the VR display
vrDisplay.submitFrame();
}
| 规范 | 状态 | 注释 |
|---|---|---|
|
WebVR 1.1
The definition of 'timestamp' in that specification. |
草案 | 初始定义 |
| 桌面 | 移动 | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
timestamp
弃用
|
Chrome No | Edge 15 — 79 |
Firefox
55
|
IE No | Opera ? | Safari No | WebView Android No |
Chrome Android
56 — 80
Disabled
|
Firefox Android 55 | Opera Android ? | Safari iOS ? |
Samsung Internet Android
6.0
|
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。
见实现注意事项。
用户必须明确启用此特征。