HTMLImageElement.naturalHeight

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HTMLImageElement 接口的 naturalHeight property is a read-only value which returns the intrinsic (natural), density-corrected height of the image in CSS pixels . This is the height the image is if drawn with nothing constraining its height; if you don't specify a height for the image, or place the image inside a container that either limits or expressly specifies the image height, it will be rendered this tall.

句法

let naturalHeight = htmlImageElement.naturalHeight;

值

An integer value indicating the intrinsic height, in CSS pixels, of the image. This is the height at which the image is naturally drawn when no constraint or specific value is established for the image. This natural height is corrected for the pixel density of the device on which it's being presented, unlike height .

If the intrinsic height is not available—either because the image does not specify an intrinsic height or because the image data is not available in order to obtain this information, naturalHeight returns 0.

范例

This example simply displays both the natural, density-adjusted size of an image as well as its rendered size as altered by the page's CSS and other factors.

HTML

<div class="box">
  <img src="/files/16797/clock-demo-400px.png" class="image">
</div>
<div class="output">
</div>

The HTML features a 400x398 pixel image which is placed inside a <div> .

CSS

.box {
  width: 200px;
  height: 200px;
}
.image {
  width: 100%;
}
.output {
  padding-top: 2em;
}

The main thing of note in the CSS above is that the style used for the container the image will be drawn in is 200px wide, and the image will be drawn to fill its width (100%).

JavaScript

let output = document.querySelector(".output");
let image = document.querySelector("img");
window.addEventListener("load", event => {
  output.innerHTML += `Natural size: ${image.naturalWidth} x ` +
                      `${image.naturalHeight} pixels<br>`;
  output.innerHTML += `Displayed size: ${image.width} x ` +
                      `${image.height} pixels`;
});

The JavaScript code simply dumps the natural and as-displayed sizes into the <div> with the class output . This is done in response to the window's load event handler, in order to ensure that the image is available before attempting to examine its width and height.

结果

规范

规范	状态	注释
HTML 实时标准 The definition of 'HTMLImageElement.naturalheight' in that specification.	实时标准

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
`naturalHeight`	Chrome 1	Edge 12	Firefox Yes	IE 9	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android ?	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持
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元数据

最后修改： Sep 3, 2019

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句法

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HTML

CSS

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结果

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