HTMLVideoElement.videoWidth

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句法
范例
规范
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HTMLVideoElement interface's read-only videoWidth property indicates the intrinsic width of the video, expressed in CSS pixels. In simple terms, this is the width of the media in its natural size. 见 About intrinsic width and height 了解更多细节。

句法

width = htmlVideoElement.videoWidth;

值

An integer value specifying the intrinsic width of the video in CSS pixels. If the element's readyState is HTMLMediaElement.HAVE_NOTHING , then the value of this property is 0, because neither video nor poster frame size information is yet available.

About intrinsic width and height

A 用户代理 calculates the intrinsic width and height of the element's media by starting with the media's raw pixel width and height, then taking into account factors including:

The media's aspect ratio.
The media's clean aperture (the sub-rectangle centered within the media that matches the target aspect ratio).
The target device's resolution.
Any other factors required by the media format.

If the element is currently displaying the poster frame rather than rendered video, the poster frame's intrinsic size is considered to be the size of the <video> 元素。

If at any time the intrinsic size of the media changes and the element's readyState isn't HAVE_NOTHING ， resize event will be sent to the <video> element. This can happen when the element switches from displaying the poster frame to displaying video content, or when the displayed video track changes.

范例

This example creates a handler for the resize event that resizes the <video> element to match the intrinsic size of its contents.

let v = document.getElementById("myVideo");
v.addEventListener("resize", ev => {
  let w = v.videoWidth;
  let h = v.videoHeight;
  if (w && h) {
    v.style.width = w;
    v.style.height = h;
  }
}, false);

Note that this only applies the change if both the videoWidth 和 videoHeight are non-zero. This avoids applying invalid changes when there's no true information available yet for dimensions.

规范

规范	状态	注释
HTML 实时标准 The definition of 'HTMLVideoElement.videoWidth' in that specification.	实时标准
HTML5 The definition of 'HTMLVideoElement.videoWidth' in that specification.	推荐	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
`videoWidth`	Chrome Yes	Edge 12	Firefox 4	IE 9	Opera 10.5	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android 4	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持

元数据

最后修改： Mar 18, 2019

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句法

值

About intrinsic width and height

范例

规范

浏览器兼容性

图例

相关话题