{"id":10422,"date":"2022-05-28T21:32:23","date_gmt":"2022-05-28T13:32:23","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10422"},"modified":"2022-06-10T23:34:20","modified_gmt":"2022-06-10T15:34:20","slug":"css-layer-rule","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2022\/05\/css-layer-rule\/","title":{"rendered":"\u8be6\u89e3\u65e5\u540e\u5b9a\u4f1a\u5927\u89c4\u6a21\u4f7f\u7528\u7684CSS @layer \u89c4\u5219"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10422\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=10422<\/a> \u946b\u7a7a\u95f4-\u946b\u751f\u6d3b<br \/>\n\u672c\u6587\u6b22\u8fce\u5206\u4eab\u4e0e\u805a\u5408\uff0c\u5168\u6587\u8f6c\u8f7d\u5c31\u4e0d\u5fc5\u4e86\uff0c\u5c0a\u91cd\u7248\u6743\uff0c\u5708\u5b50\u5c31\u8fd9\u4e48\u5927\uff0c\u82e5\u6025\u7528\u53ef\u4ee5\u8054\u7cfb\u6388\u6743\u3002<\/p>\n<p><script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/202205-at-layer.jpg';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/layer-cover.jpg\" width=\"480\" height=\"301\" alt=\"\u5c01\u9762\u56fe-\u62ab\u8428\u53ef\u4e50\" class=\"alignnone clip thumb size-medium\" \/><\/p>\n<h3>\u4e00\u3001@layer \u8bde\u751f\u7684\u80cc\u666f<\/h3>\n<p>\u5148\u4ecb\u7ecd\u4e0b\u8fd9\u4e2a\u89c4\u5219\u51fa\u73b0\u7684\u80cc\u666f\u3002<\/p>\n<p>\u6211\u4eec\u5728\u5b9e\u9645\u5f00\u53d1\u7684\u65f6\u5019\uff0c\u7ecf\u5e38\u4f1a\u4f7f\u7528\u7b2c\u4e09\u65b9\u7ec4\u4ef6\u3002<\/p>\n<p>\u4f46\u662f\u8fd9\u4e9b\u7ec4\u4ef6\u867d\u7136\u529f\u80fd\u662f\u6211\u4eec\u9700\u8981\u7684\uff0c\u4f46\u662f UI \u6837\u5f0f\u5374\u548c\u4ea7\u54c1\u7684\u98ce\u683c\u4e0d\u4e00\u81f4\uff0c\u6211\u4eec\u9700\u8981\u5bf9\u8fd9\u4e9b\u7ec4\u4ef6\u7684 UI \u8fdb\u884c\u91cd\u7f6e\uff0c\u6362\u4e2a\u80a4\uff0c\u53d8\u4e2a\u8272\u4ec0\u4e48\u7684\u3002<\/p>\n<p>\u5982\u4f55\u91cd\u7f6e\u5462\uff1f<\/p>\n<p>\u5f88\u7b80\u5355\uff0c\u4f7f\u7528\u4f18\u5148\u7ea7\u66f4\u9ad8\u7684\u9009\u62e9\u5668\u8fdb\u884c\u8986\u76d6\u5373\u53ef\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>.container .some-button {}<\/pre>\n<p>\u90a3\u6211\u8986\u76d6\u7684\u65f6\u5019\uff0c\u5c31\u518d\u589e\u52a0\u4e00\u70b9\u6743\u91cd\u3002<\/p>\n<pre>body .container .some-button {}<\/pre>\n<p>\u5c31\u53ef\u4ee5\u4e86\uff01<\/p>\n<p>\u8fd9\u6837\u7684\u4ee3\u7801\u5728\u9879\u76ee\u4e2d\u5176\u5b9e\u662f\u5c61\u89c1\u4e0d\u9c9c\u7684\u3002<\/p>\n<p>\u7136\u800c\uff0c\u8fd9\u6837\u7684\u4ee3\u7801\u53c8\u81ed\u53c8\u957f\u3002<\/p>\n<hr>\n<p>\u6709\u4e9b Web \u7ec4\u4ef6\u751a\u81f3\u8fd8\u6709 CSS reset \u4ee3\u7801\uff0c\u800c\u6240\u6709\u7684 CSS \u5728\u540c\u4e00\u4e2a\u6587\u6863\u6d41\u4e2d\u90fd\u516c\u7528\u540c\u4e00\u4e2a\u4e0a\u4e0b\u6587\uff08\u65e0\u8bba\u662f Shadow DOM \u8fd8\u662f iframe \u90fd\u53ef\u4ee5\u770b\u6210\u662f\u4e00\u4e2a\u72ec\u7acb\u7684\u4e0a\u4e0b\u6587\uff09\uff0c\u8fd9\u5c31\u5bfc\u81f4\u8fd9\u4e9bCSS\u4ee3\u7801\u4f1a\u5f71\u54cd\u5168\u5c40\u6837\u5f0f\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u7ec4\u4ef6\u5185\u8bbe\u7f6e\u4e86\uff1a<\/p>\n<pre>a { color: blue; }\r\na:hover { color: darkblue; }<\/pre>\n<p>\u7531\u4e8e\u5f15\u5165\u7ec4\u4ef6\u7684 CSS \u5f80\u5f80\u90fd\u5728\u9879\u76ee common.css \u7684\u540e\u65b9\uff0c\u6240\u4ee5\u4f18\u5148\u7ea7\u66f4\u9ad8\uff0c\u5bfc\u81f4\u6574\u4e2a\u7f51\u9875\u7684\u94fe\u63a5\u5143\u7d20\u7684\u989c\u8272\u90fd\u88ab\u6c61\u67d3\u4e86\u3002<\/p>\n<p>\u9700\u8981\u5c06 common.css \u4e2d\u7684\u76f8\u5173\u4f18\u5148\u7ea7\u63d0\u9ad8\u624d\u884c\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>body a { color: blue; }\r\nbody a:hover { color: blue; }<\/pre>\n<hr>\n<p>\u518d\u8bf4\u4e00\u4e2a\u56f0\u6270\u6211\u81ea\u5df1\u5f88\u4e45\u7684\u4f8b\u5b50\u3002<\/p>\n<p>\u5bf9\u4e8e\u94fe\u63a5\u5143\u7d20\u7684 CSS reset\uff0c\u6700\u597d\u7684\u65b9\u6cd5\u662f\u4f7f\u7528 <code>:any-link<\/code> \u4f2a\u7c7b\uff08\u300aCSS\u9009\u62e9\u5668\u4e16\u754c\u300b\u6709\u8be6\u7ec6\u4ecb\u7ecd\uff09\uff1a<\/p>\n<pre>:any-link { color: blue; }\r\n:any-link:hover { color: darkblue; }<\/pre>\n<p>\u8bed\u4e49\u6700\u597d\uff0c\u5339\u914d\u6700\u7cbe\u51c6\uff0c\u4e14\u65e0\u9700\u62c5\u5fc3 <code>:visited<\/code> \u4f2a\u7c7b\u7684\u5e72\u6270\u3002<\/p>\n<p>\u7136\u800c\uff0c\u8fd9\u4e2a\u4f2a\u7c7b\u5374\u5f88\u5c11\u89c1\u4eba\u4f7f\u7528\uff0c\u5c31\u662f\u56e0\u4e3a\u4f2a\u7c7b\u7684\u4f18\u5148\u7ea7\u6bd4\u8f83\u9ad8\uff0c\u4e00\u65e6\u8bbe\u7f6e\uff0c\u67d0\u4e2a <code>&lt;a&gt;<\/code> \u5143\u7d20\u6309\u94ae\u60f3\u8981\u91cd\u7f6e\u989c\u8272\uff0c\u6240\u9700\u8981\u7684\u9009\u62e9\u5668\u6210\u672c\u5c31\u4f1a\u5f88\u9ad8\uff0c\u63d0\u9ad8\u4e86\u6574\u4e2a\u9879\u76ee\u7684\u9009\u62e9\u5668\u590d\u6742\u5ea6\u3002<\/p>\n<p>\u4ee5\u4e0a\u4e09\u4e2a\u573a\u666f\u63cf\u8ff0\u90fd\u6307\u5411\u4e86\u540c\u4e00\u4e2a\u95ee\u9898\uff0c\u540c\u4e00\u4e2a CSS \u4e0a\u4e0b\u6587\u4e2d\uff0c\u6709\u4e9b CSS \u58f0\u660e\u9700\u8981\u8bbe\u7f6e\u4f4e\u4f18\u5148\u7ea7\uff0c\u4e14\u8fd9\u79cd\u4f18\u5148\u7ea7\u4e0d\u53d7\u9009\u62e9\u5668\u6743\u91cd\u7684\u5f71\u54cd\u3002<\/p>\n<p><code>@layer<\/code> \u89c4\u5219\u5c31\u662f\u89e3\u51b3\u4e0a\u9762\u8fd9\u79cd\u573a\u666f\u5e94\u8fd0\u800c\u751f\u7684\u3002<\/p>\n<p>\u53ef\u4ee5\u8ba9 CSS \u58f0\u660e\u7684\u4f18\u5148\u7ea7\u4e0b\u964d\u4e00\u6574\u4e2a\u7ea7\u8054\u7ea7\u522b\u3002<\/p>\n<h3>\u4e8c\u3001@layer \u7684\u4f5c\u7528<\/h3>\n<p>\u5bf9\u4e8e\u7ec4\u4ef6\u6216\u8005\u6a21\u5757\u7684CSS\uff0c\u6211\u4eec\u53ef\u4ee5\u5168\u90e8\u5199\u5728 @layer \u89c4\u5219\u4e2d\uff0c\u628a\u81ea\u8eab\u7684\u4f18\u5148\u7ea7\u964d\u5230\u5e95\u90e8\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>@layer {\r\n    .container .some-button { height: 30px; }\r\n    :any-link { color: blue; }\r\n    :any-link:hover { color: darkblue; }\r\n}<\/pre>\n<p>\u6b64\u65f6\uff0c\u4e1a\u52a1\u4e2d\u7684 CSS \u4ee3\u7801\u5c31\u53ef\u4ee5\u65e0\u89c6\u7ec4\u4ef6CSS\u4e2d\u7684\u4f18\u5148\u7ea7\u4e86\uff0c\u76f4\u63a5\u8fd9\u6837\u8bbe\u7f6e\u5c31\u53ef\u4ee5\u8fdb\u884c\u91cd\u7f6e\uff1a<\/p>\n<pre>.some-button { height: 40px; }\r\na { color: deepskyblue; }\r\na:hover { color: skyblue; }<\/pre>\n<p>\u6b64\u65f6\u7684\u6309\u94ae\u548c\u94fe\u63a5\u7684\u6e32\u67d3\u60f3\u5982\u4e0b\u56fe\uff0c\u53ef\u4ee5\u770b\u5230\uff0c\u6309\u94ae\u9ad8\u5ea6\u662f 40px\uff0c\u94fe\u63a5\u989c\u8272\u4e5f\u662f\u201c\u6df1\u5929\u84dd\u8272\u201d\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_171324.png\" width=\"355\" height=\"195\" alt=\"\u6548\u679c\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5728\u5f00\u53d1\u8005\u5de5\u5177\u7684\u6837\u5f0f\u9762\u677f\u4e2d\uff0c\u53ef\u4ee5\u770b\u5230\u4e0b\u56fe\u6240\u793a\u7684 CSS \u4f18\u5148\u7ea7\u5e94\u7528\u4ee3\u7801\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_171507.png\" width=\"400\" height=\"163\" alt=\"\u6309\u94ae\u7684\u4f18\u5148\u7ea7\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u94fe\u63a5\u5143\u7d20\u4e5f\u662f\u5982\u6b64\uff0c:any-link \u9009\u62e9\u5668\u867d\u7136\u4f18\u5148\u7ea7\u66f4\u9ad8\uff0c\u4f46\u662f\u7531\u4e8e\u5728 @layer \u89c4\u5219\u4e2d\uff0c\u6240\u4ee5\u8fd8\u662f\u4e0d\u53ca a \u8fd9\u4e2a\u6807\u7b7e\u9009\u62e9\u5668\u7684\u4f18\u5148\u7ea7\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_171654.png\" width=\"365\" height=\"309\" alt=\"\u94fe\u63a5\u5143\u7d20\u7684\u4f18\u5148\u7ea7\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202205\/css-layer-rule-demo.php\" rel=\"noopener\" target=\"_blank\">CSS @layer\u89c4\u5219\u4f4e\u4f18\u5148\u7ea7demo<\/a><\/p>\n<h3>\u4e09\u3001\u8be6\u89e3 @layer \u89c4\u5219\u7684\u8bed\u6cd5<\/h3>\n<p>@layer \u8fd9\u4e2a CSS at-rule\uff08AT\u89c4\u5219\uff09\u7684\u8bed\u6cd5\u5982\u4e0b\uff1a<\/p>\n<pre>@layer layer-name {rules};\r\n@layer layer-name;\r\n@layer layer-name, layer-name, layer-name;\r\n@layer {rules};<\/pre>\n<p>\u4e0a\u9762\u90a3\u4e2a\u4f8b\u5b50\u4f7f\u7528\u7684\u662f\u7b2c4\u884c\u8fd9\u4e2a\u8bed\u6cd5 <code>@layer {rules}<\/code>\uff0c\u4e0d\u518d\u91cd\u590d\u4ecb\u7ecd\uff0c\u8fd9\u91cc\u5c55\u5f00\u4ecb\u7ecd\u4e0b\u5176\u4ed6\u4e09\u79cd\u8bed\u6cd5\u3002<\/p>\n<h4>\u8bed\u6cd5\u4e4b\u540d\u79f0\u52a0\u89c4\u5219<\/h4>\n<p>@layer \u8fd8\u652f\u6301\u6307\u5b9a\u7ea7\u8054\u5c42\u7684\u540d\u79f0\uff0c\u9002\u5408\u7528\u5728\u9700\u8981\u591a\u4e2a\u7ea7\u8054\u5206\u5c42\u7684\u573a\u666f\uff0c\u65b9\u4fbf\u7ef4\u62a4\u4e0e\u7ba1\u7406\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>@layer button {\r\n  .container .some-button { \r\n    height: 30px;\r\n  }\r\n}\r\n@layer link {\r\n  :any-link {\r\n    color: blue;\r\n  }\r\n  :any-link:hover {\r\n    color: darkblue;\r\n  }\r\n}<\/pre>\n<h4>\u8bed\u6cd5\u4e4b\u5355\u540d\u79f0<\/h4>\n<p>\u90a3 <code>@layer layer-name<\/code> \u8fd9\u4e2a\u8bed\u6cd5\u6709\u4ec0\u4e48\u7528\u5462\uff1f<\/p>\n<p>\u4e3b\u8981\u662f\u7528\u6765\u7075\u6d3b\u8bbe\u7f6e @layer \u89c4\u5219\u548c\u5176\u4ed6 @layer \u89c4\u5219\u7684\u524d\u540e\u4f18\u5148\u7ea7\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u6709\u4e00\u4e2a\u7ea7\u8054\u5c42\uff0c\u540d\u4e3a peacock\uff0c \u5e0c\u671b\u8fd9\u4e2a\u7ea7\u8054\u5c42\u7ea7\u522b\u6700\u4f4e\uff0c\u4f46\u662f\uff0c\u76f8\u5173\u7684 CSS \u4ee3\u7801\u4f4d\u7f6e\u5374\u65e0\u6cd5\u63a7\u5236\uff0c\u6709\u53ef\u80fd\u5728\u5929\u8fb9\uff0c\u4e5f\u53ef\u80fd\u5728\u773c\u524d\uff0c\u6b64\u65f6\uff0c<code>@layer layer-name<\/code>\u8fd9\u4e2a\u8bed\u6cd5\u5c31\u53ef\u4ee5\u5927\u653e\u5149\u5f69\u4e86\u3002<\/p>\n<pre>@layer peacock;\r\n\r\n\/* \u4e07\u6c34\u5343\u5c71\u603b\u662f\u60c5\uff0c\u75ab\u60c5\u4f55\u65f6\u624d\u80fd\u505c\uff1f *\/\r\n\r\n\u2026\u2026CSS\u5927\u519b\u2026\u2026\r\n\r\n<img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_175809.jpg\" width=\"300\" height=\"77\" alt=\"2000 years later\" class=\"alignnone size-medium\" \/>\r\n\r\n\/* \u867d\u7136\u6211\u5728\u540e\u65b9\uff0c\u4f46\u6211\u4f18\u5148\u7ea7\u6700\u524d *\/\r\n\r\n@layer peacock {\r\n  .blttom-layer {\r\n      coontent: 'zhangxinxu'\r\n  }\r\n}<\/pre>\n<h4>\u8bed\u6cd5\u4e4b\u591a\u540d\u79f0<\/h4>\n<p><code>@layer layer-name, layer-name, layer-name<\/code> \u7684\u8bed\u6cd5\u4f5c\u7528\u4e5f\u662f\u7c7b\u4f3c\u7684\uff0c\u53ef\u4ee5\u6839\u636e\u81ea\u5df1\u7684\u9700\u6c42\u8c03\u6574 @layer \u89c4\u5219\u7684\u6574\u4f53\u4f18\u5148\u7ea7\u3002<\/p>\n<p>\u5728\u9ed8\u8ba4\u60c5\u51b5\u4e0b\uff0c@layer \u89c4\u5219\u5185 CSS \u58f0\u660e\u7684\u4f18\u5148\u7ea7\u662f\u6309\u7167\u524d\u540e\u987a\u5e8f\u6765\u7684\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>@layer zhang {\r\n  button {\r\n    padding: 10px;\r\n  }\r\n}\r\n@layer xinxu {\r\n  button {\r\n    padding: 20px;\r\n  }\r\n}<\/pre>\n<p>\u6d4b\u8bd5\uff0c\u6309\u94ae\u7684\u5185\u95f4\u8ddd\u5927\u5c0f\u662f 20px\uff0c\u6548\u679c\u56fe\u89c1\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_174316.png\" width=\"79\" height=\"78\" alt=\"\u5b9e\u9645\u5e94\u7528\u7684\u6309\u94ae\u5c3a\u5bf8\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u5982\u679c\u6211\u4eec\u5e0c\u671b zhang \u7ea7\u8054\u5c42\u7684\u4f18\u5148\u7ea7\u5927\u4e8e xinxu \u8fd9\u4e2a\u7ea7\u8054\u5c42\u7684\u4f18\u5148\u7ea7\uff0c\u4f7f\u7528\u591a\u540d\u79f0\u8bed\u6cd5\u8bbe\u7f6e\u4e0b\u524d\u540e\u4f4d\u7f6e\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<p>\u8fd9\u6837\u5b50\u5904\u7406\uff1a<\/p>\n<pre>@layer xinxu, zhang;\r\n@layer zhang {\r\n  button { padding: 10px; }\r\n}\r\n@layer xinxu {\r\n  button { padding: 20px; }\r\n}<\/pre>\n<p>\u6b64\u65f6\uff0c\u6309\u94ae\u7684 <code>padding<\/code> \u503c\u5e94\u7528\u7684\u662f <code>10px<\/code>.<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_180729.png\" width=\"59\" height=\"50\" alt=\"\u6309\u94ae\u5e94\u752810px\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u6d4f\u89c8\u5668\u4e2d\u7684\u4ee3\u7801\u6e32\u67d3\u4f18\u5148\u7ea7\u793a\u610f\uff08Firefox \u6d4f\u89c8\u5668\u793a\u610f\uff09\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_180709.png\" width=\"306\" height=\"140\" alt=\"\u4f18\u5148\u7ea7\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<h3>\u56db\u3001\u8ba9\u6574\u4e2aCSS\u6587\u4ef6\u53d8\u6210 @layer<\/h3>\n<p>\u5bf9\u4e8e\u7b2c\u4e09\u65b9\u7684 CSS \u6587\u4ef6\uff0c\u5c24\u5176\u662f\u90a3\u4e9b\u8d70 CDN \u7684\u7edd\u5bf9\u5730\u5740 CSS\uff0c\u6211\u4eec\u662f\u6ca1\u529e\u6cd5\u4fee\u6539\u76f8\u5173\u7684\u4ee3\u7801\u7684\uff0c\u6b64\u65f6\u6709\u529e\u6cd5\u8ba9\u8fd9\u90e8\u5206 CSS \u53d8\u6210\u4f4e\u4f18\u5148\u7ea7\u7684\u7ea7\u8054\u5c42\u5417\uff1f<\/p>\n<p>\u4e5f\u662f\u53ef\u4ee5\u7684\uff0c\u4e0b\u9762\u4e24\u79cd\u7528\u6cd5\u53ef\u4ee5\u5c1d\u8bd5\u3002<\/p>\n<h4>1. @import \u4e2d\u4f7f\u7528<\/h4>\n<p>CSS \u539f\u751f\u652f\u6301 @import \u5bfc\u5165\u5176\u4ed6 CSS \u6587\u4ef6\uff0c\u5f88\u591a\u6587\u7ae0\u90fd\u8bf4\u4e0d\u63a8\u8350\u4f7f\u7528 @import \u8bed\u6cd5\uff0c\u8fd9\u4e2a\u8981\u8fa9\u8bc1\u770b\u3002<\/p>\n<p>@import \u7684\u95ee\u9898\u5728\u4e8e\u8bf7\u6c42\u963b\u585e\uff0c\u4ee5\u53ca\u91cd\u590d\u8bf7\u6c42\u3002<\/p>\n<p>\u8bf7\u6c42\u963b\u585e\u5e76\u4e0d\u662f @import \u7684\u95ee\u9898\uff0c\u800c\u662f CSS \u672c\u8eab\u7684\u95ee\u9898\uff0c\u9875\u9762\u6e32\u67d3\u7684\u6027\u8d28\u8981\u6c42\u6837\u5f0f\u5fc5\u987b\u63d0\u524d\u52a0\u8f7d\u5b8c\u6bd5\uff0c\u4e14\u8981\u4fdd\u8bc1\u987a\u5e8f\u3002<\/p>\n<p>\u81f3\u4e8e\u91cd\u590d\u8bf7\u6c42\uff0c\u5bf9\u4e8e\u540c\u4e00\u4e2a\u9875\u9762\uff0c\u53ea\u8981\u4e0d\u5b58\u5728 N \u4e2a CSS \u6307\u5411\u540c\u4e00\u4e2a CSS \u6a21\u5757\u7684\u573a\u666f\uff0c@import \u5c31\u4e0d\u4f1a\u6709\u8fd9\u4e2a\u7684\u95ee\u9898\u3002<\/p>\n<p>\u76f8\u53cd\uff0c\u4f5c\u4e3a\u51e0\u4e4e\u552f\u4e00\u7684\u6d4f\u89c8\u5668\u539f\u751f\u652f\u6301\u7684 CSS \u6a21\u5757\u52a0\u8f7d\u65b9\u6cd5\uff0c@import \u7684\u4f7f\u7528\u662f\u5229\u5927\u4e8e\u5f0a\u7684\uff08\u5728\u975e\u6846\u67b6\u652f\u6301\u7684\u573a\u666f\u4e0b\uff09\u3002<\/p>\n<p>\u626f\u8fdc\u4e86\uff0c\u56de\u5230\u8fd9\u91cc\u3002<\/p>\n<p>\u5982\u679c\u5e0c\u671b\u5bfc\u5165\u5176\u4ed6 CSS \u6587\u4ef6\u4f4e\u4f18\u5148\u7ea7\uff0c\u53ef\u4ee5\u8fd9\u4e48\u8bbe\u7f6e\uff1a<\/p>\n<pre>@import '.\/zxx.lib.css' layer(lib);<\/pre>\n<p>\u4e5f\u5c31\u662f\u5728\u4f20\u7edf\u7684 @import \u8bed\u6cd5\u540e\u9762\u518d\u6dfb\u52a0\u4e2a layer(some-name) \u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<p>\u6b64\u65f6\uff0czxx.lib.css \u91cc\u9762\u6240\u6709 CSS \u58f0\u660e\u7684\u4f18\u5148\u7ea7\u90fd\u4f1a\u4f4e\u4e8e\u5e38\u89c4\u8bbe\u7f6e\u7684 CSS \u58f0\u660e\u3002<\/p>\n<p>\u5176\u4e2d\u7684\u540d\u79f0\u4f60\u53ef\u4ee5\u81ea\u5df1\u4efb\u610f\u5b9a\u4e49\uff0c\u5982\u679c\u60f3\u8981\u8c03\u6574 layer(some-name) \u7684\u4f18\u5148\u7ea7\uff0c\u53ef\u4ee5\u53c2\u7167\u591a\u540d\u79f0\u90a3\u91cc\u7684\u7528\u6cd5\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>layer zhangxinxu, lib;\r\n@import '.\/zxx.lib.css' layer(lib);\r\n@layer zhangxinxu {\r\n\r\n}<\/pre>\n<p>\u540c\u65f6\uff0c\u4e5f\u652f\u6301\u533f\u540d\u5f15\u5165\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>@import '.\/zxx.lib.css' layer;<\/pre>\n<p>\u4e5f\u5c31\u662f\u76f4\u63a5\u4f7f\u7528 layer \u5173\u952e\u5b57\uff0c\u800c\u4e0d\u662f\u4f5c\u4e3a\u4e00\u4e2a\u65b9\u6cd5\u4f7f\u7528\u3002<\/p>\n<h4>2. &lt;link&gt; \u5143\u7d20\u5f15\u7528(*)<\/h4>\n<p>\u76f4\u63a5\u770b\u4f7f\u7528\u793a\u610f\uff1a<\/p>\n<pre>&lt;!-- zxx-lib.css\u7684\u6837\u5f0f\u5c5e\u4e8e\u540d\u4e3a lib \u7684\u7ea7\u8054\u5c42 --&gt;\r\n&lt;link rel=\"stylesheet\" href=\"zxx-lib.css\" layer=\"lib\"&gt;\r\n\r\n&lt;!-- \u6837\u5f0f\u5f15\u5165\u5230\u4e00\u4e2a\u533f\u540d\u7ea7\u8054\u5c42\u4e2d --&gt;\r\n&lt;link rel=\"stylesheet\" href=\"zxx-lib.css\" layer&gt;<\/pre>\n<p>\u540c\u6837\uff0c\u652f\u6301\u81ea\u5b9a\u4e49\u540d\u79f0\uff0c\u4e5f\u652f\u6301\u533f\u540d\u7528\u6cd5\u3002<\/p>\n<p>\u6ce8\u610f\uff0c<code>&lt;link&gt;<\/code> \u5143\u7d20\u652f\u6301\u81ea\u5b9a\u4e49\u7684 <code>layer<\/code> \u5c5e\u6027\u7684\u8bed\u6cd5\u76ee\u524d\u5904\u4e8e<a href=\"https:\/\/github.com\/whatwg\/html\/issues\/7540\" rel=\"noopener\" target=\"_blank\">\u6253\u7b97\u5f00\u53d1\u7684\u9636\u6bb5<\/a>\uff0c\u5e76\u6ca1\u6709\u6b63\u5f0f\u652f\u6301\u3002<\/p>\n<p>\u4ee5\u53ca\uff0c\u8fd8\u6709\u53ef\u80fd\u4f1a\u5bf9 support \u51fd\u6570\u8fdb\u884c\u6269\u5c55\uff0c\u4f7f\u652f\u6301 media \u5a92\u4f53\u67e5\u8be2\u4f7f\u7528\uff1a<\/p>\n<pre>&lt;link rel=\"stylesheet\" href=\"zxx.lib.css\" layer=\"zhangxinxu\" media=\"supports(at-rule(@layer))\"&gt;<\/pre>\n<h3>\u4e94\u3001@layer \u89c4\u5219\u7684\u5d4c\u5957<\/h3>\n<p><code>@layer<\/code> \u89c4\u5219\u8fd8\u652f\u6301\u66f4\u52a0\u590d\u6742\u7684\u5d4c\u5957\u8bed\u6cd5\u3002<\/p>\n<p>\u5148\u770b\u4e00\u4e2a\u6bd4\u8f83\u7b80\u5355\u7684\u5d4c\u5957\u4f8b\u5b50\uff1a<\/p>\n<pre>@layer outer {\r\n    button {\r\n        width: 100px;\r\n        height: 30px;    \r\n    }\r\n    @layer inner {\r\n        button {\r\n            height: 40px;\r\n            width: 160px;\r\n        }    \r\n    }\r\n}<\/pre>\n<p>\u6b64\u65f6\uff0cbutton \u9009\u62e9\u5668\u7684\u4f18\u5148\u7ea7\u662f\u5916\u5c42\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e\u5185\u5c42\u7684\u3002<\/p>\n<p>\u5927\u5bb6\u53ef\u4ee5\u8fd9\u4e48\u7406\u89e3\uff0c\u6ca1\u591a\u4e00\u5c42 @layer\uff0c\u5219\u6837\u5f0f\u7684\u4f18\u5148\u7ea7\u5c31\u4e0b\u964d\u4e00\u5c42\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u4e0a\u9762\u7684\u4ee3\u7801\uff0c\u6700\u7ec8\u751f\u6548\u7684\u662f\u5916\u9762\u7684 <code>width:100px<\/code> \u548c <code>height:30px<\/code>\uff0c\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_200740.png\" width=\"334\" height=\"177\" alt=\"\u6309\u94ae\u6e32\u67d3\u5c3a\u5bf8\u6548\u679c\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u4ee3\u7801\u8fd9\u91cc\u7684\u4f18\u5148\u7ea7\u8986\u76d6\u5173\u7cfb\u89c1\u8fd9\u91cc\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_205143.png\" width=\"390\" height=\"203\" alt=\"\u6309\u94ae\u6837\u5f0f\u7684\u8986\u76d6\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u773c\u89c1\u4e3a\u5b9e\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202205\/css-layer-rule-nested-demo.php\" rel=\"noopener\" target=\"_blank\">CSS @layer\u89c4\u5219\u5d4c\u5957\u4f7f\u7528demo<\/a><\/p>\n<h4>\u70b9.\u7ea7\u8054\u5199\u6cd5<\/h4>\n<p>\u4e0a\u9762\u7684\u5185\u5916\u5d4c\u5957\u8bed\u6cd5\u8fd8\u53ef\u4ee5\u5199\u6210\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n<pre>@layer outer {\r\n  button {\r\n    width: 100px;\r\n    height: 30px;    \r\n  }\r\n}\r\n@layer outer.inner {\r\n  button {\r\n    height: 40px;\r\n    width: 160px;\r\n  }    \r\n}<\/pre>\n<p>\u6e32\u67d3\u6548\u679c\u662f\u4e00\u6a21\u4e00\u6837\u7684\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_205752.png\" width=\"372\" height=\"242\" alt=\"\u7ea7\u8054\u5199\u6cd5\" class=\"alignnone size-medium\" \/><\/p>\n<h4>\u591a\u5d4c\u5957\u8bed\u6cd5\u4e0b\u7684\u4f18\u5148\u7ea7<\/h4>\n<p>\u5185\u90e8\u7684 @layer \u7684\u4f18\u5148\u7ea7\u7531\u5916\u90e8\u7684 @layer \u89c4\u5219\u51b3\u5b9a\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>@layer \u7532 {\r\n  p { color: red; }\r\n  @layer \u4e59 {\r\n    p { color: green; }\r\n  }\r\n}\r\n@layer \u4e19 {\r\n  p { color: orange; }\r\n  @layer \u4e01 {\r\n    p { color: blue; }\r\n  }\r\n}<\/pre>\n<p>\u5176\u4e2d\u7684\u4f18\u5148\u7ea7\u5927\u5c0f\u662f\u8fd9\u6837\u7684\uff1a\u4e19 &gt; \u4e19.\u4e01 &gt; \u7532 &gt; \u7532.\u4e59<\/p>\n<p>\u6253\u5f00\u6d4f\u89c8\u5668\u53ef\u4ee5\u770b\u5230\u4e0b\u9762\u7684\u4f18\u5148\u7ea7\u8986\u76d6\u5173\u7cfb\uff0c\u4f8b\u5982 Firefox \u6d4f\u89c8\u5668\u4e0b\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_210438.png\" width=\"285\" height=\"281\" alt=\"\u5d4c\u5957 @layer \u7684\u4f18\u5148\u7ea7\" class=\"alignnone size-medium\" \/><\/p>\n<h3>\u516d\u3001\u5176\u4ed6\u4e00\u4e9b\u8bf4\u660e<\/h3>\n<p><code>@layer<\/code> \u89c4\u5219\u4e2d\u5982\u679c\u4f7f\u7528\u4e86 <code>!important<\/code>\uff0c\u5219\u4f1a\u8df3\u8dc3\u5230\u5176\u4ed6\u7ea7\u8054\u5c42\u4e0a\uff0c\u5177\u4f53\u7ec6\u8282\u53c2\u89c1\u4e0a\u4e00\u7bc7\u6587\u7ae0\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2022\/05\/deep-in-css-cascade\/\">CSS\u5fc5\u5b66\u57fa\u7840\uff1a\u7406\u89e3CSS\u4e2d\u7684\u7ea7\u8054\u89c4\u5219<\/a>\u201d\u3002<\/p>\n<h4>\u517c\u5bb9\u6027<\/h4>\n<p>\u76ee\u524d\u6240\u6709\u73b0\u4ee3\u6d4f\u89c8\u5668\u5747\u5df2\u7ecf\u652f\u6301 <code>@layer<\/code> \u89c4\u5219\u3002<\/p>\n<p>\u50cf\u8fd9\u79cd\u4e00\u51fa\u73b0\u5c31\u6240\u6709\u6d4f\u89c8\u5668\u8ddf\u8fdb\u652f\u6301\u7684\u7279\u6027\u90fd\u662f\u5de8\u725b\u5de8\u5b9e\u7528\u7684\u7279\u6027\uff0c\u4e0d\u51fa\u4e09\u5e74\uff0c\u8fd9\u4e2a\u73a9\u610f\u4e00\u5b9a\u4f1a\u5728\u4e1a\u754c\u904d\u5730\u5f00\u82b1\uff0c\u5230\u5904\u4f7f\u7528\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202205\/2022-05-28_212020.png\" width=\"553\" height=\"270\" alt=\"@layer\u89c4\u5219\u7684\u517c\u5bb9\u6027\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u597d\uff0c\u5c31\u8bf4\u8fd9\u4e48\u591a\u5427\u3002<\/p>\n<p>\u5199\u4f5c\u4e0d\u6613\uff0c\u5982\u679c\u60a8\u89c9\u5f97\u5185\u5bb9\u4e0d\u9519\uff0c\u6b22\u8fce<button onclick=\"shareWeixin.click()\" class=\"entry-share-btn\">\u5206\u4eab<\/button>\u3002<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/emtion\/emoji\/2764.svg\" width=\"20\" height=\"20\" align=\"absmiddle\"><\/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\/202205\/layer-cover.jpg\" width=\"160\" height=\"100\" alt=\"\u5c01\u9762\u56fe-\u62ab\u8428\u53ef\u4e50\" class=\"alignright size-medium\" loading=\"lazy\" \/><\/p>\n<p>\u6211\u8bdd\u5c31\u653e\u5728\u8fd9\u91cc\u4e86\uff0c\u4e0d\u51fa\u4e09\u5e74\uff0cCSS @layer 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