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HTMLImageElement
Baseline Widely available *
This feature is well established and works across many devices and browser versions. It’s been available across browsers since 2015年7月.
* Some parts of this feature may have varying levels of support.
HTMLImageElement 接口提供了特别的属性和方法 (在常规的HTMLElement之外，它也能通过继承使用) 来操纵<img> 元素的布局和图像。
Constructor
Image()Image()构造器，带有两个可选的参数，分别表示资源的宽度和高度，创建了一个尚未被插入 DOM 树中的HTMLImageElement实例。When called without parameters,new Image()is equivalent to callingdocument.createElement("img").
属性
从它的父元素HTMLElement 继承的属性。
HTMLImageElement.altHTMLImageElement.complete只读返回一个
Boolean如果浏览器已经下载完毕，并且图像是受支持的图片类型、解码的过程中没有发生错误，则返回true。That means this value is alsotrueif the image has nosrcvalue indicating an image to load.HTMLImageElement.crossOrigin一个
DOMString表示这个 img 元素的 CORS 设置。参考CORS settings attributes。This may benullif CORS is not used.HTMLImageElement.currentSrc只读返回一个
DOMString表示加载当前显示的图像的 URL。这可能会改变，因为图像是调整，由于不断变化的条件，由任何media queries 的地方。HTMLImageElement.decodingAn optional
DOMStringrepresenting a hint given to the browser on how it should decode the image. If this value is provided, it must be one of the possible permitted values:syncto decode the image synchronously,asyncto decode it asynchronously, orautoto indicate no preference (which is the default). Read thedecodingpage for details on the implications of this property's values.HTMLImageElement.height一个整数，表示 HTML 属性
height，说明了图像在 CSS 像素中渲染的高度。HTMLImageElement.isMap一个
Boolean表示 HTML 属性ismap，说明了图像是某个服务器端图像映射的一部分。This is different from a client-side image map, specified using an<img>element and a corresponding<map>which contains<area>elements indicating the clickable areas in the image. The imagemust be contained within an<a>element; see theismappage for details.HTMLImageElement.naturalHeight只读返回一个整数，如果可用的话，表明图像在 CSS 中固有的高度，单位为像素；否则返回
0。如果图片是以其原来的大小渲染，则此值等于图片的高度。HTMLImageElement.naturalWidth只读返回一个整数，如果可用的话，表明图像在 CSS 中固有的宽度，单位为像素；否则返回
0。如果图片是以其原来的大小渲染，则此值等于图片的宽度。HTMLImageElement.referrerPolicyA
DOMStringthat reflects thereferrerpolicyHTML attribute, which tells theuser agent how to decide which referrer to use in order to fetch the image. Read this article for details on the possible values of this string.HTMLImageElement.sizes实验性A
DOMStringreflecting thesizesHTML attribute. This string specifies a list of comma-separated conditional sizes for the image; that is, for a given viewport size, a particular image size is to be used. Read the documentation on thesizespage for details on the format of this string.HTMLImageElement.srcHTMLImageElement.srcset实验性一个
DOMString表示 HTML 属性srcset，包含了候选图像列表，用逗号分隔（',', U+002C COMMA）。一个候选的图像是一个 URL 跟着一个'w'表示图像的宽度，或者一个'x'表示像素密度。HTMLImageElement.useMap一个
DOMString表示 HTML 属性usemap，包含一个<map>元素的页面本地 URL。The page-local URL is a pound (hash) symbol (#) followed by the ID of the<map>element, such as#my-map-element. The<map>in turn contains<area>elements indicating the clickable areas in the image.HTMLImageElement.width一个整数，表示 HTML 属性
width，说明图像在 CSS 像素中渲染的宽度。HTMLImageElement.x只读实验性An integer indicating the horizontal offset of the left border edge of the image's CSS layout box relative to the origin of the
<html>element's containing block.HTMLImageElement.y只读实验性The integer vertical offset of the top border edge of the image's CSS layout box relative to the origin of the
<html>element's containing block.
已废弃的属性
HTMLImageElement.align已弃用一个
DOMString，表示图像如何与它周围的内容对齐。The possible values are"left","right","justify", and"center". This is obsolete; you should instead use CSS (such astext-align, which works with images despite its name) to specify the alignment.HTMLImageElement.border已弃用HTMLImageElement.hspace已弃用一个整数值，指定图像左右的留白，单位为像素。
HTMLImageElement.longDesc已弃用一个
USVString，specifying the URL at which a long description of the image's contents may be found. This is used to turn the image into a hyperlink automatically. Modern HTML should instead simply place an<img>inside an<a>element defining the hyperlink.HTMLImageElement.lowSrc已弃用一个
USVString，specifying the URL of a low-quality (but faster to load) version of the same image. This was once used by browsers under constrained network conditions or on slow devices.HTMLImageElement.name已弃用一个
DOMString，representing the name of the element.HTMLImageElement.vspace已弃用一个整数值，指定图像上下的留白，单位为像素。
方法
从它的父元素HTMLElement 继承的方法。
HTMLImageElement.decode()Returns a
Promisethat resolves when the image is decoded and it's safe to append the image to the DOM. This prevents rendering of the next frame from having to pause to decode the image, as would happen if an undecoded image were added to the DOM.
错误
- The
srcattribute is empty ornull. - The specified
srcURL is the same as the URL of the page the user is currently on. - The specified image is corrupted in some way that prevents it from being loaded.
- The specified image's metadata is corrupted in such a way that it's impossible to retrieve its dimensions, and no dimensions were specified in the
<img>element's attributes. - The specified image is in a format not supported by theuser agent.
If an error occurs while trying to load or render the image, and anonerror event handler has been configured to handle theerror event, that event handler will get called. This can happen in a number of situations, including:
例子
var img1 = new Image(); // Image 构造器img1.src = "image1.png";img1.alt = "alt";document.body.appendChild(img1);var img2 = document.createElement("img"); // 使用 DOM HTMLImageElementimg2.src = "image2.jpg";img2.alt = "alt text";document.body.appendChild(img2);// 使用文档中的第一个 imgalert(document.images[0].src);规范
| Specification |
|---|
| HTML # htmlimageelement |
浏览器兼容性
参见
- 实现了这个接口的 HTML 元素：
<img>