HTMLImageElement.width

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width 特性为 HTMLImageElement interface indicates the width at which the image is drawn, in CSS pixels if the image is being drawn or rendered to any visual medium such as the screen or a printer; otherwise, it's the natural, pixel density corrected width of the image.

句法

htmlImageElement.width = newWidth;
let width = htmlImageElement.width;

值

An integer value indicating the width of the image. The terms in which the width is defined depends on whether the image is being rendered to a visual medium or not.

If the image is being rendered to a visual medium such as a screen or printer, the width is expressed in CSS pixels .
Otherwise, the image's width is represented using its natural (intrinsic) width, adjusted for the display density as indicated by naturalWidth .

范例

In this example, two different sizes are provided for an image of a clock using the srcset attribute. One is 200px wide and the other is 400px wide. Further, the sizes attribute is provided to specify the width at which the image should be drawn given the viewport's width.

HTML

Specifically, for viewports up to 400px wide, the image is drawn at a width of 200px; otherwise, it's drawn at 400px.

<p>Image width: <span class="size">?</span>px (resize to update)</p>
<img src="/files/16864/clock-demo-200px.png"
      alt="Clock"
      srcset="/files/16864/clock-demo-200px.png 200w,
          /files/16797/clock-demo-400px.png 400w"
      sizes="(max-width: 400px) 200px, 400px">

JavaScript

The JavaScript code looks at the width to determine the width of the image at the moment. This is done in the window's load and resize event handlers, in order to always provide this information.

var clockImage = document.querySelector("img");
let output = document.querySelector(".size");
const updateWidth = event => { output.innerText = clockImage.width; };
window.addEventListener("load", updateWidth);
window.addEventListener("resize", updateWidth);

结果

This example may be easier to try out in its own window .

规范

规范	状态	注释
HTML 实时标准 The definition of 'HTMLImageElement.width' 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
`width`	Chrome 1	Edge 12	Firefox Yes	IE ?	Opera Yes	Safari Yes	WebView Android Yes	Chrome Android Yes	Firefox Android Yes	Opera Android Yes	Safari iOS Yes	Samsung Internet Android Yes

图例

完整支持
兼容性未知 ?

元数据

最后修改： Sep 26, 2019

在此页

句法

值

范例

HTML

JavaScript

结果

规范

浏览器兼容性

图例

相关话题