获取 DOM 里所有图片（包括背景和iframe）

在写浏览器扩展什么的时候可能会用上。

获取 DOM 里的图片主要是在这几个地方里面找: 元素, background-image CSS 属性和 </code>。<h1 id="img"><a href="https://blog.crimx.com//2017/03/09/get-all-images-in-dom-including-background/#img" aria-label="img permalink"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>img</h1>如果只想获取 <code><img></code> 的图片，有两种方式:直接获取所有 <code>img</code> 标签:<div data-language="javascript"><pre><code>function getImgs (doc) { return Array.from(doc.getElementsByTagName('img')) .map(img => ({ src: img.currentSrc, // 用 img.src 如果要本来的 src width: img.naturalWidth, height: img.naturalHeight })) } getImgs(document)</code></pre></div>还可以用 <a href="https://developer.mozilla.org/en-US/docs/Web/API/Document/images">document.images</a>:<div data-language="javascript"><pre><code>function getImgs (doc) { return Array.from(doc.images) .map(img => ({ src: img.currentSrc, // img.src if you want the origin width: img.naturalWidth, height: img.naturalHeight })) } getImgs(document)</code></pre></div><h1 id="background-image"><a href="https://blog.crimx.com//2017/03/09/get-all-images-in-dom-including-background/#background-image" aria-label="background image permalink"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>background-image</h1>获得背景图片需要查看所有 DOM 节点的 <code>background-image</code> 属性:<div data-language="javascript"><pre><code>function getBgImgs (doc) { const srcChecker = /url$\s*?['"]?\s*?(\S+?)\s*?["']?\s*?$/i return Array.from( Array.from(doc.querySelectorAll('*')) .reduce((collection, node) => { let prop = window.getComputedStyle(node, null) .getPropertyValue('background-image') // match `url(...)` let match = srcChecker.exec(prop) if (match) { collection.add(match[1]) } return collection }, new Set()) ) } getBgImgs(document)</code></pre></div>背景图片不能直接得到尺寸信息，如果需要的话要加载一遍。因为搜集的图片很有可能已经在浏览器缓存里，所以加载过程应该很快。<div data-language="javascript"><pre><code>function loadImg (src, timeout = 500) { var imgPromise = new Promise((resolve, reject) => { let img = new Image() img.onload = () => { resolve({ src: src, width: img.naturalWidth, height: img.naturalHeight }) } img.onerror = reject img.src = src }) var timer = new Promise((resolve, reject) => { setTimeout(reject, timeout) }) return Promise.race([imgPromise, timer]) } function loadImgAll (imgList, timeout = 500) { return new Promise((resolve, reject) => { Promise.all( imgList .map(src => loadImg(src, timeout)) .map(p => p.catch(e => false)) ).then(results => resolve(results.filter(r => r))) }) } loadImgAll(getBgImgs(document)).then(imgs => console.log(imgs))</code></pre></div><h1 id="iframe"><a href="https://blog.crimx.com//2017/03/09/get-all-images-in-dom-including-background/#iframe" aria-label="iframe permalink"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>iframe</h1>只需要递归遍历 iframe 的 document<div data-language="javascript"><pre><code>function searchIframes (doc) { var imgList = [] doc.querySelectorAll('iframe') .forEach(iframe => { try { iframeDoc = iframe.contentDocument || iframe.contentWindow.document imgList = imgList.concat(getImgs(iframeDoc) || []) // or getBgImgs(iframeDoc) imgList = imgList.concat(searchIframes(iframeDoc) || []) } catch (e) { // 直接忽略错误的 iframe (e.g. cross-origin) } }) return imgList } searchIframes(document)</code></pre></div><h1 id="整合一起"><a href="https://blog.crimx.com//2017/03/09/get-all-images-in-dom-including-background/#%E6%95%B4%E5%90%88%E4%B8%80%E8%B5%B7" aria-label="整合一起 permalink"><svg aria-hidden="true" focusable="false" height="16" version="1.1" viewbox="0 0 16 16" width="16"><path fill-rule="evenodd" d="M4 9h1v1H4c-1.5 0-3-1.69-3-3.5S2.55 3 4 3h4c1.45 0 3 1.69 3 3.5 0 1.41-.91 2.72-2 3.25V8.59c.58-.45 1-1.27 1-2.09C10 5.22 8.98 4 8 4H4c-.98 0-2 1.22-2 2.5S3 9 4 9zm9-3h-1v1h1c1 0 2 1.22 2 2.5S13.98 12 13 12H9c-.98 0-2-1.22-2-2.5 0-.83.42-1.64 1-2.09V6.25c-1.09.53-2 1.84-2 3.25C6 11.31 7.55 13 9 13h4c1.45 0 3-1.69 3-3.5S14.5 6 13 6z"></path></svg></a>整合一起</h1>直接使用就行。<div data-language="javascript"><pre><code>function getImgAll (doc) { return new Promise((resolve, reject) => { loadImgAll(Array.from(searchDOM(doc))) .then(resolve, reject) }) function searchDOM (doc) { const srcChecker = /url$\s*?['"]?\s*?(\S+?)\s*?["']?\s*?$/i return Array.from(doc.querySelectorAll('*')) .reduce((collection, node) => { // bg src let prop = window.getComputedStyle(node, null) .getPropertyValue('background-image') // match `url(...)` let match = srcChecker.exec(prop) if (match) { collection.add(match[1]) } if (/^img$/i.test(node.tagName)) { // src from img tag collection.add(node.src) } else if (/^frame$/i.test(node.tagName)) { // iframe try { searchDOM(node.contentDocument || node.contentWindow.document) .forEach(img => { if (img) { collection.add(img) } }) } catch (e) {} } return collection }, new Set()) } function loadImg (src, timeout = 500) { var imgPromise = new Promise((resolve, reject) => { let img = new Image() img.onload = () => { resolve({ src: src, width: img.naturalWidth, height: img.naturalHeight }) } img.onerror = reject img.src = src }) var timer = new Promise((resolve, reject) => { setTimeout(reject, timeout) }) return Promise.race([imgPromise, timer]) } function loadImgAll (imgList, timeout = 500) { return new Promise((resolve, reject) => { Promise.all( imgList .map(src => loadImg(src, timeout)) .map(p => p.catch(e => false)) ).then(results => resolve(results.filter(r => r))) }) } } getImgAll(document).then(list => console.log(list))</code></pre></div>如果是开发 Chrome 插件则不受跨域影响，可以直接使用 <a href="https://github.com/nodeca/probe-image-size">probe-image-size</a>，它支持 timeout 参数，就不需要自己写 timer 了。我在写一个 <a href="https://github.com/crimx/crx-weitweet">Chrome 扩展</a>时用上了，很方便。</div> </article> <div class="joe_detail__agree"> <div class="agree"> <div class="icon"> 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