How to get the original size of an image using JavaScript All In One

How to get the original size of an image using JavaScript All In One

如何使用 JavaScript 获取一个图片像的原始大小

naturalWidth & naturalHeight

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`;
});

https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/naturalWidth
https://developer.mozilla.org/en-US/docs/Web/API/HTMLImageElement/naturalHeight

Experimental ⚠️

https://developer.mozilla.org/en-US/docs/Web/API/PerformanceElementTiming/naturalWidth
https://developer.mozilla.org/en-US/docs/Web/API/PerformanceElementTiming/naturalHeight

WHATWG

The IDL attributes naturalWidth and naturalHeight must return the density-corrected natural width and height of the image, in CSS pixels, if the image has density-corrected natural width and height and is available, or else 0.

如果图像具有密度校正的自然宽度和高度并且可用，则 IDL 属性 naturalWidth 和 naturalHeight 必须返回图像的密度校正的自然宽度和高度（以 CSS 像素为单位），否则返回 0.

https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-naturalwidth
https://html.spec.whatwg.org/multipage/embedded-content.html#dom-img-naturalheight

https://caniuse.com/?search=naturalWidth %26 naturalHeight

demos

<img src="https://i.stack.imgur.com/deTzi.jpg?s=256&amp;g=1" alt="xgqfrms's user avatar" width="128" height="128" class="bar-sm bar-md d-block">

const img = document.querySelector(`img`);
img.naturalHeight;
// 256
img.naturalWidth;
// 256

aspect ratio / 纵横比

Rendered size:	128 × 128 px
Rendered aspect ratio:	1∶1
Intrinsic size:	256 × 256 px
Intrinsic aspect ratio:	1∶1
File size:	27.0 kB
Current source:	https://i.stack.imgur.com/deTzi.jpg?s=256&g=1

渲染尺寸：128 × 128 像素
渲染纵横比：1:1
内在尺寸：256 × 256 像素
固有长宽比：1:1
文件大小：27.0 kB
当前来源：https://i.stack.imgur.com/deTzi.jpg?s=256&g=1

https://stackoverflow.com/users/5934465/xgqfrms?tab=reputation

refs

https://stackoverflow.com/questions/77120785/display-images-side-by-side-with-equal-height

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