{"id":10440,"date":"2022-06-12T01:07:22","date_gmt":"2022-06-11T17:07:22","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10440"},"modified":"2022-06-12T01:10:05","modified_gmt":"2022-06-11T17:10:05","slug":"css-var-optional-empty-trick","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2022\/06\/css-var-optional-empty-trick\/","title":{"rendered":"\u4ecb\u7ecd\u4e00\u79cdCSS\u53d8\u91cf\u672a\u5b9a\u4e49\u8bed\u6cd5\u4e5fOK\u7684\u5c0f\u5999\u62db"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=10440\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=10440<\/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\/202206-var-unset.jpg';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202206\/cover-var-default.jpg\" width=\"480\" height=\"308\" alt=\"\u5360\u4f4d\u56fe CSS\u53d8\u91cf\u6280\u5de7\" class=\"alignright clip thumb size-medium\" \/><\/p>\n<h3>\u4e00\u3001\u5148\u770b\u6848\u4f8b<\/h3>\n<p>\u5728\u300aCSS\u4e16\u754c\u300bP30 \u9875\u90a3\u91cc\u6709\u4ecb\u7ecd\u8fc7\u4e00\u4e2a <code>transform<\/code> \u52a8\u753b\u548c <code>transform<\/code> \u5b9a\u4f4d\u51b2\u7a81\u7684\u573a\u666f\uff0c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202206\/p30-transform.png\" width=\"633\" height=\"464\" alt=\"\u51b2\u7a81\u63cf\u8ff0\u573a\u666f\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u7528\u4e00\u53e5\u8bdd\u63cf\u8ff0\u5c31\u662f\uff1a<\/p>\n<p>\u5f39\u6846\u7b49\u5c45\u4e2d\u5b9a\u4f4d\u5143\u7d20\u5982\u679c\u4f7f\u7528 <code>transform:translate(-50%,50%)<\/code> \u504f\u79fb\u5b9e\u73b0\uff0c\u5219\u5b9a\u4f4d\u5143\u7d20\u7684\u663e\u793a\u52a8\u753b\u5982\u679c\u5305\u542b <code>transform<\/code> \u53d8\u5316\uff0c\u5219\u4f1a\u53d1\u751f\u51b2\u7a81\uff0c\u4f7f\u5b9a\u4f4d\u5931\u6548\u3002<\/p>\n<p>\u6211\u4e66\u4e2d\u63d0\u51fa\u7684\u89e3\u51b3\u65b9\u6848\u662f\u5bbd\u9ad8\u8bbe\u7f6e\u4e3a <code>fit-content<\/code>\uff0c\u8fd9\u6837\u5c31\u53ef\u4ee5\u4f7f\u7528<code> inset:0<\/code> + <code>margin:auto<\/code> \u5b9e\u73b0\u4e0d\u5f71\u54cd <code>transform<\/code> \u52a8\u753b\u7684\u5c45\u4e2d\u5bf9\u9f50\u6548\u679c\u4e86\u3002<\/p>\n<p>\u9664\u4e86\u4f7f\u7528\u517c\u5bb9\u6027\u597d\u4e0d\u592a\u597d\u7684 translate\uff0cscale\uff0crotate\u5c5e\u6027\u8fdb\u884c\u5206\u79bb\u8bbe\u7f6e\u5916\uff0c\u6700\u8fd1\u6211\u53d1\u73b0\uff0c\u5176\u5b9e\u8fd8\u6709\u4e00\u79cd\u66f4\u53e6\u7c7b\u7684\u5de7\u5999\u65b9\u6cd5\u53ef\u4ee5\u5904\u7406\u6b64\u95ee\u9898\u3002<\/p>\n<p>\u90a3\u5c31\u662f\u9017\u53f7\u540e\u9762\u7559\u7a7a\u7684 CSS \u81ea\u5b9a\u4e49\u5c5e\u6027\u8bed\u6cd5\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>transform: var(--transform, ) scale(1);<\/pre>\n<h3>\u4e8c\u3001\u6df1\u5165CSS\u53d8\u91cf\u7f3a\u7701\u503c<\/h3>\n<p>CSS\u53d8\u91cf\u6d4f\u89c8\u5668\u8fd8\u6ca1\u6709\u600e\u4e48\u652f\u6301\u7684\u65f6\u5019\uff082016\u5e74\uff09\u6211\u5c31\u7387\u5148\u7814\u7a76\u4e0e\u4ecb\u7ecd\u8fc7\u4e86\uff0c\u89c1\u6b64\u6587\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2016\/11\/css-css3-variables-var\/\">\u4e86\u89e3CSS\u53d8\u91cfvar<\/a>\u201d\uff0c\u91cc\u9762\u4ecb\u7ecd\u4e86\u5f88\u591aCSS\u53d8\u91cf\u7684\u7ec6\u8282\u77e5\u8bc6\u3002<\/p>\n<p>\u7136\u800c\uff0c\u5b66\u65e0\u6b62\u5883\uff0c\u6211\u4ee5\u4e3a\u4e86\u89e3\u4e86\u5168\u90e8\uff0c\u5b9e\u9645\u4e0a\u8fd8\u662f\u6709\u77e5\u8bc6\u7684\u76f2\u533a\u3002<\/p>\n<p>\u4e0b\u9762\u8fd9\u4e2a\u57fa\u7840\u7279\u6027\u76f8\u4fe1\u5927\u5bb6\u90fd\u77e5\u9053\u3002<\/p>\n<p>\u5373 CSS \u53d8\u91cf\u662f\u652f\u6301\u7f3a\u7701\u503c\u7684\uff0c\u4e5f\u5c31\u662f\u5f53 CSS \u81ea\u5b9a\u4e49\u5c5e\u6027\u6ca1\u6709\u5b9a\u4e49\u7684\u65f6\u5019\u4f7f\u7528\u7684\u503c\uff0c\u4f8b\u5982\u4e0b\u9762\u7684\u7528\u6cd5\u793a\u610f\uff1a<\/p>\n<pre>color: var(--color, skyblue);<\/pre>\n<p>\u5982\u679c <code>--color<\/code> \u672a\u5b9a\u4e49\uff0c\u6211\u4eec\u5c31\u4f7f\u7528 skyblue \u4f5c\u4e3a\u989c\u8272\u503c\u3002<\/p>\n<p>\u4f46\u662f\uff0c\u6015\u662f\u5f88\u591a\u4eba\u5e76\u4e0d\u77e5\u9053\uff0c\u540e\u9762\u7684\u90a3\u4e2a\u9ed8\u8ba4\u515c\u5e95\u7684\u7f3a\u7701\u503c\u662f\u53ef\u4ee5\u4e0d\u5199\u7684\uff0c\u6ce8\u610f\uff0c\u662f\u4e0d\u5199\uff0c\u4e0d\u662f\u6ca1\u6709\u8fd9\u4e2a\u53c2\u6570\uff0c\u53c2\u6570\u8fd8\u5728\uff0c\u8868\u73b0\u51fa\u6765\u7684\u6548\u679c\u5c31\u662f\u62ec\u53f7\u5185\u6709\u4e2a\u5149\u79c3\u79c3\u7684\u9017\u53f7\uff0c\u5c31\u50cf\u4e0b\u9762\u8fd9\u6837\uff1a<\/p>\n<pre>color: var(--color, );<\/pre>\n<p>\u8fd9\u662f\u4ec0\u4e48\u610f\u601d\u5462\uff1f<\/p>\n<p>\u5c31\u662f\u5982\u679c <code>--color<\/code> \u672a\u5b9a\u4e49\uff0c\u5219\u6b64\u53d8\u91cf\u5f53\u4f5c\u6ca1\u5b58\u5728\uff0c\u672a\u8bbe\u7f6e\u3002<\/p>\n<p>\u6ce8\u610f\uff0c\u8fd9\u4e2a\u8bed\u6cd5\u548c\u4e0b\u9762\u7684\u8bed\u6cd5\u533a\u522b\u5de8\u5927\uff0c\u4e0d\u662f\u540c\u4e00\u4e2a\u4e1c\u897f\u3002<\/p>\n<pre>color: var(--color);<\/pre>\n<p>\u6211\u4eec\u770b\u4e00\u4e2a\u4f8b\u5b50\u5c31\u77e5\u9053\u533a\u522b\u5728\u54ea\u91cc\u4e86\uff0c\u6709\u5982\u4e0b\u7684 HTML \u548c CSS\uff1a<\/p>\n<pre>&lt;p class=\"zhang\"&gt;\u989c\u8272\u662f\uff1f&lt;\/p&gt;\r\n&lt;p class=\"xinxu\"&gt;\u989c\u8272\u662f\uff1f&lt;\/p&gt;<\/pre>\n<pre>.zhang {\r\n  color: deeppink var(--color, );\r\n}\r\n.xinxu {\r\n  color: deeppink var(--color);\r\n}<\/pre>\n<p>\u6b64\u65f6\uff0c.zhang \u7c7b\u540d\u5bf9\u5e94\u7684 <code>&lt;p&gt;<\/code> \u5143\u7d20\u7684\u989c\u8272\u548c .xinxu \u7c7b\u540d\u5bf9\u5e94\u7684 <code>&lt;p&gt;<\/code> \u5143\u7d20\u662f\u4e0d\u4e00\u6837\u7684\uff0c\u5b9e\u9645\u6e32\u67d3\u6548\u679c\u5982\u4e0b\u622a\u56fe\u6240\u793a\uff08\u5b9e\u65f6\u6e32\u67d3\uff0c\u684c\u9762\u6d4f\u89c8\u5668\u53ef\u4ee5\u6253\u5f00\u63a7\u5236\u53f0\u67e5\u770b\u6e90\u7801\uff09\uff1a<\/p>\n<div style=\"padding:5px 1rem;border:1px dashed #ddd;\">\n<p class=\"zhang\">\u989c\u8272\u662f\uff1f<\/p>\n<p class=\"xinxu\">\u989c\u8272\u662f\uff1f<\/p>\n<\/div>\n<style>.zhang { color: deeppink var(--color, );}.xinxu { color: deeppink var(--color);}<\/style>\n<p>\u53ef\u4ee5\u770b\u5230\uff0c\u4e0a\u9762\u4e00\u884c\u6587\u5b57\u7684\u989c\u8272\u662f\u6df1\u7c89\u8272\uff0c\u800c\u4e0b\u9762\u4e00\u884c\u7684\u6587\u5b57\u989c\u8272\u662f\u9ed1\u8272\u3002<\/p>\n<p>\u539f\u56e0\u5728\u4e8e\u5f53 <code>--color<\/code> \u672a\u5b9a\u4e49\u7684\u65f6\u5019\uff0c<code>deeppink var(--color, )<\/code> \u7b49\u540c\u4e8e <code>deeppink<\/code>\uff0c\u56e0\u6b64\u989c\u8272\u662f\u6df1\u7c89\u8272\uff0c\u800c <code>deeppink var(--color)<\/code> \u53ef\u4ee5\u770b\u6210\u662f <code>deeppink undefined<\/code> \uff0c\u8bed\u6cd5\u65e0\u6548\uff0c\u4e8e\u662f\u4f7f\u7528\u7ee7\u627f\u7684\u9ed1\u8272\u3002<\/p>\n<h3>\u4e09\u3001\u5728\u591a\u503cCSS\u5c5e\u6027\u4e2d\u7684\u5e94\u7528<\/h3>\n<p>\u5bf9\u4e8e\u5355\u503c CSS \u5c5e\u6027\uff0c\u7a7a\u767d\u7f3a\u7701\u503c\u7684\u4ef7\u503c\u5e76\u4e0d\u662f\u5f88\u660e\u663e\uff0c\u56e0\u4e3a\u4f7f\u7528\u6216\u8005\u4e0d\u4f7f\u7528\u533a\u522b\u5e76\u4e0d\u662f\u5f88\u5927\u3002<\/p>\n<p>\u4f8b\u5982\uff1a<\/p>\n<pre>div {\r\n    border-radius: var(--radius, );\r\n}<\/pre>\n<p>\u548c<\/p>\n<pre>div {\r\n    border-radius: var(--radius);\r\n}<\/pre>\n<p>\u7684\u6e32\u67d3\u8868\u73b0\u90fd\u662f\u4e00\u81f4\u7684\u3002<\/p>\n<p>\u4f46\u662f\u5728\u591a\u503c CSS \u5c5e\u6027\u4e2d\uff0c\u60c5\u51b5\u5c31\u5b8c\u5168\u4e0d\u540c\u4e86\u3002<\/p>\n<p>\u56de\u5230\u4e00\u5f00\u59cb\u7684 <code>transform<\/code> \u51b2\u7a81\u7684\u573a\u666f\u8fd9\u91cc\uff0c\u5982\u679c\u6211\u4eec\u7684 <code>transform<\/code> \u52a8\u753b\u8fd9\u4e48\u8bbe\u7f6e\uff0c\u90a3\u4e48\u5c31\u80fd\u5f88\u5927\u7a0b\u5ea6\u4e0a\u907f\u514d <code>transform<\/code> \u5c5e\u6027\u4f7f\u7528\u51b2\u7a81\u7684\u95ee\u9898\u4e86\u3002<\/p>\n<pre>@keyframes scaleIn {\r\n    from {\r\n        transform: var(--transform, ) scale(0.1);\r\n    }\r\n    to {\r\n        transform: var(--transform, ) scale(1);\r\n    }\r\n}<\/pre>\n<p>\u6b64\u65f6\uff0c\u5982\u679c\u5143\u7d20\u9700\u8981\u4f7f\u7528 <code>transform<\/code> \u5b9a\u4f4d\u4e5f\u662f\u53ef\u4ee5\u7684\u4e86\uff1a<\/p>\n<pre>.target {\r\n    position: fixed;\r\n    left: 50%; top: 50%;\r\n    --transform: translate(-50%, -50%);\r\n}<\/pre>\n<p>\u6b64\u65f6\uff0c\u52a8\u753b\u6267\u884c\u7684\u65f6\u5019\uff0c\u4f1a\u628a <code>--transform<\/code> \u7684\u5c5e\u6027\u503c\u81ea\u52a8\u63d2\u5165\u8fdb\u53bb\u3002<\/p>\n<p>\u5982\u679c\u5143\u7d20\u6ca1\u6709\u8bbe\u7f6e <code>--transform<\/code> \u53d8\u91cf\uff0c\u4e5f\u6ca1\u6709\u5173\u7cfb\uff0c\u52a8\u753b\u4f1a\u5355\u7eaf\u6309\u7167 scale(.1) -> scale(1) \u8fdb\u884c\u52a8\u753b\uff0c\u529f\u80fd\u5b8c\u5168\u4e0d\u53d7\u5f71\u54cd\u3002<\/p>\n<p>\u5173\u4e8e\u8fd9\u4e2a\u4f8b\u5b50\uff0c\u6211\u4e13\u95e8\u505a\u4e86\u5728\u7ebfdemo\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/202206\/css-var-mutiple-value-demo.php\" rel=\"noopener\" target=\"_blank\">transform\u591aCSS\u5c5e\u6027\u503c\u4f9d\u7136\u52a8\u753b\u6548\u679cdemo<\/a><\/p>\n<p>\u6548\u679c\u5f55\u5c4f\u793a\u610f\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"https:\/\/image.zhangxinxu.com\/image\/blog\/202206\/transform-scale.gif\" width=\"521\" height=\"422\" alt=\"scale\u52a8\u753b\u4e0d\u51b2\u7a81\u793a\u610f\" class=\"alignnone size-medium\" \/><\/p>\n<h4>\u51e0\u4e2a\u591a\u503cCSS\u5c5e\u6027\u793a\u610f<\/h4>\n<p>CSS\u591a\u503c\u5c5e\u6027\u8fd8\u662f\u5f88\u591a\u7684\uff0c\u4e00\u79cd\u662f\u7f29\u5199\u5c5e\u6027\uff08\u4f7f\u7528\u7a7a\u683c\u548c\u659c\u6760\u5206\u9694\uff09\uff0c\u8fd8\u6709\u4e00\u79cd\u662f\u53ef\u65e0\u9650\u503c\u5c5e\u6027\uff08\u4f7f\u7528\u9017\u53f7\u5206\u9694\uff09\u3002<\/p>\n<p>\u9664\u4e86 <code>transform<\/code> \u5c5e\u6027\u5916\uff0c\u5e38\u89c1\u7684\u8fd8\u6709\uff1a<\/p>\n<pre>filter: invert(1) hue-rotate(.5turn) var(--filter,);\r\nbackground: linear-gradient(deeppink, deepskyblue) var(--bgcolor,);\r\nbox-shadow: 2px 2px 4px #0003 var(--box-shadow,);<\/pre>\n<p>\u4ee5\u53ca grid, border-image, columns, offsets, text-decoration \u7b49\u975e\u5e38\u591a\u7684\u5c5e\u6027\uff0c\u5c31\u4e0d\u4e00\u4e00\u4e3e\u4f8b\u4e86\u3002<\/p>\n<p>\u5bf9\u4e86\uff0c\u5bf9\u4e8e\u9017\u53f7\u5206\u9694\u7684\u591a\u6570\u7ec4\u503c\uff0c\u5728\u5b9a\u4e49CSS\u53d8\u91cf\u7684\u65f6\u5019\uff0c\u524d\u9762\u8bb0\u5f97\u628a\u9017\u53f7\u5199\u4e0a\u3002<\/p>\n<pre>--box-shadow: ,0 0 5px #0002;<\/pre>\n<h3>\u56db\u3001\u7ed3\u8bed\u8bf4\u660e<\/h3>\n<p>\u4e00\u53e5\u8bdd\uff0cCSS\u53d8\u91cf\u8d5b\u9ad8\u4e4b\u795e\u3002<\/p>\n<p>\u76ee\u524d\u5728\u79fb\u52a8\u7aef\u9879\u76ee\u4e2d\u5927\u5bb6\u53ef\u4ee5\u653e\u5fc3\u4f7f\u7528\uff0c\u5176\u5b9e\u6211\u770b\u5f88\u591a PC \u7f51\u7ad9\u90fd\u5728\u4f7f\u7528\u4e86\uff0c\u6bd4\u65b9\u8bf4 Bilibili\uff0c\u8fd9\u73a9\u610f\u771f\u7684\u597d\u4e8b\uff0c\u5f88\u591a\u7279\u6027\u90fd\u5f88\u5f3a\uff0c\u4f8b\u5982\u5404\u79cd\u7c7b\u578b\u7684 CSS \u5c5e\u6027\u503c\u90fd\u80fd\u652f\u6301\uff0c\u5bb9\u9519\u6027\u4e5f\u5f3a\u5230\u79bb\u8c31\uff0c\u8fdc\u4e0d\u662f\u5927\u5bb6\u8ba4\u4e3a\u7684\u6362\u6362\u989c\u8272\u8fd9\u4e48\u7b80\u5355\u3002<\/p>\n<p>\u597d\u4e86\uff0c\u5c31\u8bf4\u8fd9\u4e48\u591a\uff0c\u611f\u8c22\u5927\u5bb6\u7684\u9605\u8bfb\uff01<\/p>\n<p>\u5982\u679c\u60a8\u89c9\u5f97\u672c\u6587\u5185\u5bb9\u8fd8\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\" 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