{"id":11804,"date":"2025-08-07T20:23:26","date_gmt":"2025-08-07T12:23:26","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11804"},"modified":"2026-02-27T15:52:58","modified_gmt":"2026-02-27T07:52:58","slug":"css-sibling-index-count","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2025\/08\/css-sibling-index-count\/","title":{"rendered":"CSS\u7d22\u5f15\u548c\u6570\u91cf\u5339\u914d\u51fd\u6570sibling-index sibling-count\u7b80\u4ecb"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11804\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=11804<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4f46\u9700\u8981\u4fdd\u7559\u539f\u4f5c\u8005\u3001\u51fa\u5904\u4ee5\u53ca\u6587\u4e2d\u94fe\u63a5\uff0cAI\u6293\u53d6\u4fdd\u7559\u539f\u6587\u5730\u5740\uff0c\u4efb\u4f55\u7f51\u7ad9\u5747\u53ef\u6458\u8981\u805a\u5408\uff0c\u5546\u7528\u8bf7\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-7_202109.jpeg\" width=\"353\" height=\"217\" alt=\"\u7d22\u5f15\u6570\u91cf\u5339\u914d\u5c01\u9762\u56fe\" class=\"alignright clip size-medium\" \/><\/p>\n<h3>\u4e00\u3001\u5b50\u5143\u7d20\u7d22\u5f15\u503c\u51fd\u6570sibling-index()<\/h3>\n<p><code>sibling-index()<\/code>\u5728\u591a\u4e2a\u6709\u89c4\u5f8b\u5b50\u5143\u7d20\u6784\u5efa\u7684\u56fe\u5f62\u6216\u52a8\u753b\u6548\u679c\u7684\u573a\u666f\u4e0b\u975e\u5e38\u5b9e\u7528\u3002<\/p>\n<p>\u6211\u4eec\u6765\u770b\u4e00\u4e2a\u300aCSS\u65b0\u4e16\u754c\u300b\u8fd9\u672c\u4e66\u7684\u4e00\u4e2a\u6848\u4f8b\uff0c\u6f14\u793a\u4e0b\u5982\u4f55\u4f7f\u7528<code>sibling-index()<\/code>\u51fd\u6570\u7b80\u5316\u6211\u4eec\u7684\u5b9e\u73b0\u3002<\/p>\n<h4>\u6848\u4f8b<\/h4>\n<p>\u5148\u770b\u539f\u6765\u7684\u5b9e\u73b0\uff0c\u53ef\u4ee5\u8bbf\u95ee\u8fd9\u4e2a\u5730\u5740\uff1a<a href=\"https:\/\/demo.cssworld.cn\/new\/5\/4-3.php\">https:\/\/demo.cssworld.cn\/new\/5\/4-3.php<\/a><\/p>\n<p>\u6240\u8981\u5b9e\u73b0\u7684\u5c31\u662f\u97f3\u6ce2\u64ad\u653e\u65f6\u5019\u7684\u6ce2\u5f62\u4e0a\u4e0b\u8fd0\u52a8\u7684\u6548\u679c\u6548\u679c\uff0c\u9759\u6001\u622a\u56fe\u6548\u679c\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-4_164457.png\" width=\"131\" height=\"258\" alt=\"\u6ce2\u5f62\u52a8\u753b\u793a\u610f\" class=\"alignnone size-medium\" style=\"border:1px solid #ddd;\" \/><\/p>\n<p>\u4e4b\u524d\u7684\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff0cHTML\u90e8\u5206\uff1a<\/p>\n<pre>&lt;div class=\"loading\"&gt;\r\n    &lt;i&gt;&lt;\/i&gt;&lt;i&gt;&lt;\/i&gt;&lt;i&gt;&lt;\/i&gt;&lt;i&gt;&lt;\/i&gt;\r\n&lt;\/div&gt;<\/pre>\n<p>CSS\u4ee3\u7801\uff1a<\/p>\n<pre>.loading i {\r\n    display: inline-block;\r\n    border-left: 2px solid deepskyblue;\r\n    height: 2px;\r\n    animation: scaleUp 4s linear infinite alternate;\r\n    margin: 0 1px;\r\n}\r\n.loading i:nth-child(2) {\r\n    animation-delay: -1s;\r\n}\r\n.loading i:nth-child(3) {\r\n    animation-delay: -2s;\r\n}\r\n.loading i:nth-child(4) {\r\n    animation-delay: -3s;\r\n}\r\n\r\n@keyframes scaleUp {\r\n    to { transform: scaleY(10); }\r\n}<\/pre>\n<p>\u4f7f\u7528\u7684<code>:nth-child<\/code>\u4f2a\u7c7b\u4e0e\u4e00\u4e2a\u4e00\u4e2a\u5339\u914d\uff0c\u73b0\u5728\u6709\u4e86<code>sibling-index()<\/code>\u51fd\u6570\uff0c\u6211\u4eec\u7684\u4ee3\u7801\u5c31\u7b80\u5355\u591a\u4e86\u3002<\/p>\n<p>\u8fd9\u6837\uff1a<\/p>\n<pre>.loading i {\r\n  display: inline-block;\r\n  border-left: 2px solid deepskyblue;\r\n  height: 2px;\r\n  animation: scaleUp 1s linear infinite alternate;\r\n  margin: 0 1px;\r\n  animation-delay: calc(-0.25s * sibling-index());\r\n}\r\n\r\n@keyframes scaleUp {\r\n    to { transform: scaleY(10); }\r\n}<\/pre>\n<p>\u770b\uff0c\u4ee3\u7801\u662f\u4e0d\u662f\u7b80\u5355\u4e86\u5f88\u591a\uff1f<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-4_170447.jpeg\" width=\"100\" height=\"100\" alt=\"\u65e0\u8bed\u54e5\" class=\"alignnone size-medium\" \/><\/p>\n<h4>\u6f14\u793a<\/h4>\n<p>\u5b9e\u65f6\u6e32\u67d3\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff0c\u76ee\u524dChrome 138+\u4ee5\u4e0a\u6d4f\u89c8\u5668\u6709\u6548\u679c\u3002<\/p>\n<div class=\"loads\"><i><\/i><i><\/i><i><\/i><i><\/i><\/div>\n<style>.loads i {display: inline-block; border-left: 2px solid deepskyblue;height: 2px;animation: scaleUp 1s linear infinite alternate;margin: 0 1px;animation-delay: calc(-0.25s * sibling-index());}@keyframes scaleUp { to { transform: scaleY(10); }}<\/style>\n<h3>\u4e8c\u3001\u5b50\u5143\u7d20\u6570\u91cf\u51fd\u6570sibling-count()<\/h3>\n<p><code>sibling-count()<\/code>\u51fd\u6570\u53ef\u4ee5\u8fd4\u56de\u5f53\u524d\u5b50\u5143\u7d20\u7684\u6570\u91cf\uff0c\u7528\u5728\u7236\u5143\u7d20\u4e0a\u3002<\/p>\n<p>\u8fd8\u662f\u901a\u8fc7\u6848\u4f8b\u4e86\u89e3\u8fd9\u4e2a\u51fd\u6570\u7684\u4f5c\u7528\u5427\u3002<\/p>\n<p>\u8fd9\u91cc\u6700\u8fd1\u6211\u505a\u7684\u4e00\u4e2a\u9700\u6c42\uff0c\u8981\u6c42\u5217\u8868\u6570\u91cf\u65e0\u8bba\u591a\u5c11\uff0c\u90fd\u662f\u4e24\u884c\u5c55\u793a\uff08\u5982\u4e0b\u56fe\u6240\u793a\uff09\uff0c\u6709\u4e86<code>sibling-count()<\/code>\u51fd\u6570\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u7cbe\u786e\u5236\u5b9a\u5217\u6570\uff0c\u6765\u5b9e\u73b0\u6211\u4eec\u60f3\u8981\u7684\u6548\u679c\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-5_105941.png\" width=\"362\" height=\"157\" alt=\"\u76ee\u6807\u6548\u679c\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5982\u679c\u662f\u5782\u76f4\u6d41\u5e03\u5c40\uff0c\u6211\u4eec\u53ef\u4ee5\u4f7f\u7528Grid\u5e03\u5c40\u548c<code>grid-auto-flow<\/code>\u5c5e\u6027\uff08\u53c2\u89c1\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2020\/01\/css-grid-auto-flow\/\">CSS grid-auto-flow\u6df1\u5165\u7406\u89e3<\/a>\u201d\u4e00\u6587\uff09\u5b9e\u73b0\u3002<\/p>\n<p>\u5047\u8bbeHTML\u4ee3\u7801\u4e3a\uff1a<\/p>\n<pre>&lt;zxx-grid&gt;\r\n  &lt;zxx-item&gt;\u683c\u5b501&lt;\/zxx-item&gt;\r\n  &lt;zxx-item&gt;\u683c\u5b502&lt;\/zxx-item&gt;\r\n  ...\r\n  &lt;zxx-item&gt;\u683c\u5b508&lt;\/zxx-item&gt;\r\n  &lt;zxx-item&gt;\u683c\u5b509&lt;\/zxx-item&gt;\r\n&lt;\/zxx-grid&gt;<\/pre>\n<p>\u5219CSS\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff0c\u53ef\u4ee5\u4fdd\u8bc1\u6c38\u8fdc\u4e24\u884c\uff1a<\/p>\n<pre>zxx-grid {\r\n  display: grid;\r\n  border: solid;\r\n  overflow: auto;\r\n  grid-template-rows: 1fr 1fr;\r\n  grid-auto-flow: column;\r\n}\r\nzxx-item {\r\n  width: 100px;\r\n  outline: 1px dotted;\r\n  padding: .5rem;\r\n}<\/pre>\n<p>\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-7_190709.png\" width=\"411\" height=\"92\" alt=\"\u5782\u76f4\u6d41\u683c\u5b50\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u53ef\u82e5\u662f\u6c34\u5e73\u6d41\uff0c\u65e0\u8bba\u6570\u91cf\u591a\u5c11\uff0c\u90fd\u662f\u4e24\u884c\u9ad8\u5ea6\uff0c\u90a3\u4e48<code>sibling-count()<\/code>\u51fd\u6570\u5c31\u7279\u522b\u5b9e\u7528\u3002<\/p>\n<p>\u5b9e\u73b0\u4ee3\u7801\u5982\u4e0b\u6240\u793a\uff1a<\/p>\n<pre>zxx-grid {\r\n  display: grid;\r\n  border: solid;\r\n  overflow: auto;\r\n  grid-template-columns: repeat(round(up, calc(sibling-count() \/ 2)), auto);\r\n}\r\nzxx-item {\r\n  width: 100px;\r\n  outline: 1px dotted;\r\n  padding: .5rem;\r\n}<\/pre>\n<p>\u7ed3\u679c\u2026\u2026\u7ed3\u679c\u5b9e\u73b0\u7684\u6548\u679c\u5e76\u4e0d\u662f\u5982\u9884\u671f\u90a3\u6837\u2026\u2026\u602a\u4e86\uff0c\u8fd9\u53ef\u662f\u6309\u7167MDN\u6587\u6863\u7684\u6848\u4f8b\u5199\u7684\u5440\uff01<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-7_194420.png\" width=\"318\" height=\"359\" alt=\"\u7ad6\u6392\u4e86\" class=\"alignnone size-medium\" \/><\/p>\n<p>\ud83e\udd14\ud83e\udd14<br \/>\n\ud83e\udd14\ud83e\udd14<\/p>\n<p>\u540e\u6765\u4e00\u7814\u7a76\uff0c\u624d\u53d1\u73b0\uff0cMDN\u6587\u6863\u63d0\u4f9b\u7684\u4f8b\u5b50\u662f\u9519\u8bef\u7684\uff01<\/p>\n<p><code>sibling-count()<\/code>\u51fd\u6570\u662f\u7528\u5728\u5b50\u5143\u7d20\u4e0a\u7684\uff0c\u7b49\u540c\u4e8e <code>element.parentElement.children.length<\/code>\u3002<\/p>\n<p>\u55ef\u2026\u2026\u90a3\u8fd9\u4e2a\u51fd\u6570\u5176\u5b9e\u6ca1\u591a\u5c11\u597d\u73a9\u7684\uff0c\u4f30\u8ba1\u4f5c\u7528\u4e5f\u5c31\u662f<code>sibling-index()<\/code>\u51fd\u6570\u76f8\u51cf\uff0c\u8ba1\u7b97\u53cd\u5411\u7d22\u5f15\u503c\u3002<\/p>\n<p>\u6216\u8005\u7b49\u5bbd\u5e03\u5c40\u7528\u4e00\u7528\uff1a<\/p>\n<pre>ul li {\r\n  width: calc(100% \/ sibling-count());\r\n}<\/pre>\n<p>\u4f8b\u5982\u6d6e\u52a8\u5e03\u5c40\u6c38\u8fdc\u4e00\u884c\u663e\u793a\uff1a<\/p>\n<pre>&lt;ui-flow-root&gt;\r\n  &lt;ui-item&gt;&lt;\/ui-item&gt;\r\n  &lt;ui-item&gt;&lt;\/ui-item&gt;\r\n  &lt;ui-item&gt;&lt;\/ui-item&gt;\r\n  &lt;ui-item&gt;&lt;\/ui-item&gt;\r\n&lt;\/ui-flow-root&gt;<\/pre>\n<pre>ui-flow-root {\r\n  display: flow-root;\r\n  ui-item {\r\n    aspect-ratio: 1;\r\n    background: rgb(from deepskyblue r g b \/ calc(sibling-index() \/ sibling-count()));\r\n    width: calc(100% \/ sibling-count());\r\n    float: left;\r\n  }\r\n}<\/pre>\n<p>\u5b9e\u65f6\u6e32\u67d3\u6548\u679c\u5982\u4e0b\uff08\u76ee\u524d\u4ec5Chrome\u624d\u6709\u6548\u679c\uff09:<\/p>\n<p><ui-flow-root><ui-item><\/ui-item><ui-item><\/ui-item><ui-item><\/ui-item><ui-item><\/ui-item><\/ui-flow-root><\/p>\n<style>ui-flow-root {display: flow-root;ui-item {aspect-ratio: 1;background: rgb(from deepskyblue r g b \/ calc(sibling-index() \/ sibling-count()));width: calc(100% \/ sibling-count());float: left;}overflow: hidden;resize: both;}<\/style>\n<p><code>\u8865\u5145\u4e8e2026\u5e742\u670827\u65e5<\/code><\/p>\n<p>CodePen\u7684\u8fd9\u4e2a<a href=\"https:\/\/codepen.io\/t_afif\/pen\/xbOzxyp\" rel=\"noopener\" target=\"_blank\">\u6587\u5b57\u5f39\u52a8\u6548\u679c<\/a>\u5c31\u4f7f\u7528\u4e86\u672c\u6587\u4ecb\u7ecd\u7684<code>sibling-count()<\/code>\u548c<code>sibling-index()<\/code>\u51fd\u6570\uff0c\u6709\u5174\u8da3\u7684\u53ef\u4ee5\u4e86\u89e3\u4e0b\u3002<\/p>\n<h3>\u4e09\u3001\u517c\u5bb9\u6027\u3001\u7ed3\u8bed<\/h3>\n<p>\u76ee\u524d\u8fd9\u4e24\u4e2a\u51fd\u6570Chrome 138+\u652f\u6301\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-7_195703.png\" width=\"644\" height=\"282\" alt=\"sibling-count()\u517c\u5bb9\u6027\" class=\"alignnone size-medium\" \/><\/p>\n<p><code>sibling-count()<\/code>\u548c<code>sibling-index()<\/code>\u7684\u503c\u53ef\u4ee5\u4f7f\u7528CSS\u6570\u5b66\u51fd\u6570\u8ba1\u7b97\uff0c\u5982<code>calc()<\/code>\u3001<code>round()<\/code>\u51fd\u6570\u7b49\u3002<\/p>\n<p>\u8fd8\u80fd\u4f7f\u7528<code>content<\/code>\u5c5e\u6027\u76f4\u63a5\u660e\u6587\u663e\u793a\u6570\u91cf\u503c\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>ul li::before {\r\n  content: counter(i) \"\/\" counter(N);\r\n  counter-reset: N sibling-count() i sibling-index() \r\n}<\/pre>\n<p>\u597d\u5427\uff0c\u6bd5\u7adf\u517c\u5bb9\u6027\u8fd8\u4e0d\u662f\u5f88\u597d\uff0c\u5c31\u4e0d\u8bf4\u592a\u591a\u4e86\u3002<\/p>\n<p>\u7ee7\u7eed\u5b8b\u7389\u957f\u8001\uff0c\u770b\u5728\u5b8b\u957f\u8001\u7684\u9762\u5b50\u4e0a\uff0c\u6b22\u8fce\u70b9\u8d5e\uff0c\u8f6c\u53d1\uff01<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-7_201549.jpeg\" width=\"103\" height=\"112\" alt=\"\u5b8b\u7389\" class=\"alignnone size-medium\" \/><\/p>\n<p>\ud83d\ude09\ud83d\ude0a\ud83d\ude07<br \/>\n\ud83e\udd70\ud83d\ude0d\ud83d\ude18<\/p>\n<p>\u672c\u6587\u4e3a\u539f\u521b\u6587\u7ae0\uff0c\u4f1a\u7ecf\u5e38\u66f4\u65b0\u77e5\u8bc6\u70b9\u4ee5\u53ca\u4fee\u6b63\u4e00\u4e9b\u9519\u8bef\uff0c\u56e0\u6b64\u8f6c\u8f7d\u8bf7\u4fdd\u7559\u539f\u51fa\u5904\uff0c\u65b9\u4fbf\u6eaf\u6e90\uff0c\u907f\u514d\u9648\u65e7\u9519\u8bef\u77e5\u8bc6\u7684\u8bef\u5bfc\uff0c\u540c\u65f6\u6709\u66f4\u597d\u7684\u9605\u8bfb\u4f53\u9a8c\u3002<br \/>\n\u672c\u6587\u5730\u5740\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=11804\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=11804<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202508\/2025-8-7_202109.jpeg\" width=\"160\" height=\"98\" alt=\"\u7d22\u5f15\u6570\u91cf\u5339\u914d\u5c01\u9762\u56fe\" class=\"alignright size-medium\" loading=\"lazy\" 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