在此页

• 句法
• 范例
• 规范
• 浏览器兼容性
• 另请参阅
• 相关话题

DocumentOrShadowRoot.fullscreenElement read-only property returns the 元素 that is currently being presented in full-screen mode in this document, or null if full-screen mode is not currently in use.

Although this property is read-only, it will not throw if it is modified (even in strict mode); the setter is a no-operation and it will be ignored.

句法

var element = document.fullscreenElement;
					

返回值

元素 object that's currently in full-screen mode; if full-screen mode isn't currently in use by the document >, the returned value is null .

范例

This example presents a function, isVideoInFullscreen() , which looks at the value returned by fullscreenElement ; if the document is in full-screen mode ( fullscreenElement isn't null ) and the full-screen element's nodeName is VIDEO , indicating a <video> element, the function returns true , indicating that the video is in full-screen mode.

function isVideoInFullscreen() {
  if (document.fullscreenElement && document.fullscreenElement.nodeName == 'VIDEO') {
    return true;
  }
  return false;
}
					

规范

规范	状态	注释
全屏 API The definition of 'Document.fullscreenElement' in that specification.	实时标准	初始定义

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
fullscreenElement	Chrome 53 Prefixed 53 Prefixed Prefixed Implemented with the vendor prefix: webkit	Edge ≤18 Prefixed ≤18 Prefixed Prefixed Implemented with the vendor prefix: webkit 12 Prefixed Prefixed Implemented with the vendor prefix: ms	Firefox 64 64 不支持 47 — 65 Disabled Disabled From version 47 until version 65 (exclusive): this feature is behind the full-screen-api.unprefix.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 不支持 9 — 65 Alternate Name Alternate Name Uses the non-standard name: mozFullScreenElement	IE Yes Prefixed Yes Prefixed Prefixed Implemented with the vendor prefix: ms	Opera 40 Prefixed 40 Prefixed Prefixed Implemented with the vendor prefix: webkit	Safari Yes Prefixed Yes Prefixed Prefixed Implemented with the vendor prefix: webkit	WebView Android 53 Prefixed 53 Prefixed Prefixed Implemented with the vendor prefix: webkit	Chrome Android 53 Prefixed 53 Prefixed Prefixed Implemented with the vendor prefix: webkit	Firefox Android 64 64 不支持 47 — 65 Disabled Disabled From version 47 until version 65 (exclusive): this feature is behind the full-screen-api.unprefix.enabled preference (needs to be set to true ). To change preferences in Firefox, visit about:config. 不支持 9 — 65 Alternate Name Alternate Name Uses the non-standard name: mozFullScreenElement	Opera Android 41 Prefixed 41 Prefixed Prefixed Implemented with the vendor prefix: webkit	Safari iOS 部分支持 12 Alternate Name 部分支持 12 Alternate Name Full-screen mode is only supported on the iPad. Alternate Name Uses the non-standard name: webkitFullscreenElement	Samsung Internet Android 6.0 Prefixed 6.0 Prefixed Prefixed Implemented with the vendor prefix: webkit

图例

完整支持

完整支持

部分支持

部分支持

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。

使用非标名称。

要求使用供应商前缀或不同名称。

要求使用供应商前缀或不同名称。

另请参阅

• 全屏 API
• 全屏 API 指南
• Element.requestFullscreen()
• Document.exitFullscreen()
• :fullscreen and ::backdrop
• <iframe> allowfullscreen 属性

元数据

• 最后修改： Mar 18, 2019

相关话题

1. 全屏 API
2. DocumentOrShadowRoot
3. 特性

   1. activeElement
   2. fullscreenElement
   3. pointerLockElement
   4. styleSheets
4. 方法

   1. caretPositionFromPoint()
   2. elementFromPoint()
   3. elementsFromPoint()
   4. getSelection()
   5. msElementsFromRect()
   6. nodeFromPoint()
   7. nodesFromPoint()
5. Related pages for Fullscreen API

   1. Document.exitFullscreen()
   2. Document.fullscreen
   3. Document.onfullscreenchange
   4. Document.onfullscreenerror
   5. DocumentOrShadowRoot.fullscreenElement
   6. Element.onfullscreenchange
   7. Element.onfullscreenerror
   8. Element.requestFullscreen()