Document.timeline

这是一个实验中的功能
此功能某些浏览器尚在开发中，请参考浏览器兼容性表格以得到在不同浏览器中适合使用的前缀。由于该功能对应的标准文档可能被重新修订，所以在未来版本的浏览器中该功能的语法和行为可能随之改变。

Document 接口的 timeline 只读属性表示当前文档的默认时间轴。 此时间轴是 DocumentTimeline 的一个特殊实例，它会在网页加载时自动创建。

此时间轴对于每个文档（document）来说都是唯一的，并在文档的生命周期中保持不变，包括调用 Document.open()。

该时间线的时间值被计算为与全局时钟的固定偏移，使得零时间对应于navigationStart时刻加上称为原始时间的带符号的delta 。 在建立导航开始时刻之前，文档时间线是不活动的。

注意：与非活动文档相关联的文档时间轴也被视为是不活动的。

语法

var pageTimeline = document.timeline;
var thisMoment = pageTimeline.currentTime;

值

一个 DocumentTimeline 对象。

规则

规范 状态 备注
Web Animations
document.timeline		 Working Draft Editor's draft.

浏览器兼容性

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
timeline
Experimental
Chrome No support No
Notes
No support No
Notes
Notes Currently Chrome Canary only
Edge No support NoFirefox Full support 75IE Full support YesOpera No support NoSafari Full support 13.1WebView Android No support NoChrome Android No support No
Notes
No support No
Notes
Notes Currently Chrome Canary only
Firefox Android Full support 63
Disabled
Full support 63
Disabled
Disabled From version 63: this feature is behind the dom.animations-api.timelines.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
No support 32 — 63
Disabled
Disabled From version 32 until version 63 (exclusive): this feature is behind the dom.animations-api.core.enabled preference (needs to be set to true). To change preferences in Firefox, visit about:config.
Opera Android No support NoSafari iOS Full support 13.4Samsung Internet Android No support No

Legend

Full support  
Full support
No support  
No support
Experimental. Expect behavior to change in the future.
Experimental. Expect behavior to change in the future.
See implementation notes.
See implementation notes.
User must explicitly enable this feature.
User must explicitly enable this feature.

参见