{"id":263,"date":"2021-08-26T22:43:26","date_gmt":"2021-08-26T14:43:26","guid":{"rendered":"https:\/\/yukihiew.com\/?p=263"},"modified":"2023-10-26T13:08:01","modified_gmt":"2023-10-26T05:08:01","slug":"css-variable","status":"publish","type":"post","link":"https:\/\/yukihiew.com\/css-variable\/","title":{"rendered":"\u539f\u751fCSS\u8b8a\u6578! \u4e0d\u6703SASS\u6c92\u95dc\u4fc2\uff0c\u5148\u5f9e\u7c21\u55ae\u7248\u5b78\u8d77!"},"content":{"rendered":"\n<p>\u7576\u7db2\u9801\u5c08\u6848\u7684\u5167\u5bb9\u591a\u8d77\u4f86\u7684\u6642\u5019\uff0c\u5982\u679c\u9084\u662f\u53ea\u6703\u4e00\u500b\u5340\u584a\u4e00\u500b\u5340\u584a\u4f5c\u6a23\u5f0f\uff0c\u5728\u5f8c\u7e8c\u7dad\u8b77\u548c\u4fee\u6539\u6642\uff0c\u6703\u9020\u6210\u5de8\u5927\u7684\u9ebb\u7169\uff0c\u8981\u561b\u6c92\u6539\u5230\u3001\u8981\u561b\u4e00\u76f4\u8fa8\u8b58\u9019\u500b\u9078\u64c7\u5668\u662f\u5728\u6539\u54ea\u500b\u90e8\u4f4d\uff0c\u4f46\u5982\u679c\u5b78\u6703CSS\u8b8a\u6578\u7684\u7528\u6cd5\uff0c\u6703\u4e00\u4e0b\u5b50\u6e1b\u8f15\u5f88\u591a\u5de5\u4f5c\u91cf! <br>\u4e0d\u50c5\u80fd\u6539\u4e00\u63db\u767e\uff0c\u9084\u53ef\u4ee5\u628a\u4e4b\u524d\u4fee\u6539\u7684\u6642\u9593\u62ff\u4f86\u505a\u66f4\u591a\u6e2c\u8a66\uff0c\u4e26\u4e14\u662f\u539f\u751fCSS\u7684\u8b8a\u6578\uff0c\u4e0d\u7528\u5957\u4ef6\u4e0d\u7528\u6846\u67b6\uff0c\u591a\u65b9\u4fbf\u963f~~~<\/p>\n\n\n\n<ul class=\"has-background wp-block-list\" style=\"background-color:#e7f6ff\">\n<li><a href=\"#var\" rel=\"nofollow\">CSS\u8b8a\u6578\u7c21\u4ecb\uff1aCSS\u4e5f\u6709\u5206\u5168\u57df\u8b8a\u6578&amp;\u5340\u57df\u8b8a\u6578<\/a><\/li>\n\n\n\n<li><a href=\"#js\" rel=\"nofollow\">\u642d\u914dJS\u4e5f\u6709\u4e00\u756a\u98a8\u5473\uff1aJS\u64cd\u4f5c\u61c9\u7528<\/a><\/li>\n<\/ul>\n\n\n<h2 class=\"wp-block-heading\" id=\"var\">CSS\u8b8a\u6578\u7c21\u4ecb<\/h2>\n\n\n<p>CSS\u8b8a\u6578\u5beb\u6cd5\uff0c\u5148\u5ba3\u544a\u8b8a\u6578\u7684\u540d\u7a31\u8207\u6578\u503c\uff0c\u8981\u4f7f\u7528\u6642\u5728\u8b8a\u6578\u540d\u7a31\u5916\u5c64\u52a0\u4e0avar()\u5c31OK\u56c9!<br>\u8b8a\u6578\u540d\u7a31\u958b\u982d\u4e00\u5b9a\u8981\u52a0&#8211; \u624d\u6703\u8996\u4f5c\u662f\u5728\u5b9a\u7fa9\u8b8a\u6578\u5594!<\/p>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-1 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column is-layout-flow wp-block-column-is-layout-flow\" style=\"flex-basis:100%\">\n<pre class=\"wp-block-preformatted\">\u5b9a\u7fa9\u5340\u57df{ --\u540d\u7a31: \u503c;}<br>\u4f7f\u7528\u5340\u57df{\u5c6c\u6027: var(--\u540d\u7a31),\u66ff\u4ee3\u503c}<\/pre>\n\n\n\n<pre class=\"wp-block-code\"><code>*\u5168\u57df\u8b8a\u6578-\u5ba3\u544a\u5728:root\n:root{ --mainColor: #fffcaf;}\nh1{ color : var( --mainColor , #000 ); }\n\/\/\u5982\u679c--mainColor\u53ef\u904b\u4f5c\u5247:\n== h1{color: #fffcaf ; } \n\/\/\u5982\u679c--mainColor\u4e0d\u53ef\u904b\u4f5c\u5247:\n== h1{color: #000 ; }\n*\u5340\u57df\u8b8a\u6578 : \u5ba3\u544a\u5728\u7279\u5b9a\u5340\u584a\uff0c\u50c5\u5340\u584a\u5167\u53ef\u4f5c\u7528\nsection{ --color: #ffffff;  color: var(--color);}\nsection p{color : var(--color);}<\/code><\/pre>\n\n\n\n<p>\u6709\u4e86\u8b8a\u6578\u4f86\u6574\u5408\u5e38\u7528\u6578\u503c\uff0c\u5c31\u4e0d\u9700\u8981\u6bcf\u6b21\u90fd\u8981\u53bb\u8907\u88fd\u8272\u78bc\u6216\u8a18\u9019\u500b\u6a19\u984c\u5b57\u8981\u591a\u5927\u3001\u884c\u8ddd\u8981\u591a\u9ad8\uff0c\u800c\u4e14\u4e00\u4f46\u6709\u9700\u8981\u8abf\u6574\uff0c\u5c31\u53ea\u8981\u6539\u8b8a\u6578\u7684\u503c\u5c31\u597d\u4e86\uff0c\u4e0d\u9700\u8981\u4e00\u884c\u4e00\u884c\u53bb\u627e\u6709\u54ea\u5e7e\u500b\u5340\u584a\u7528\u5230\uff0c\u773c\u775b\u770b\u5230\u812b\u7a97\u9084\u6703\u5c11\u6539\u2026.<br>\u50cf\u9019\u6a23:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>:root{ \n--mainColor: #fffcaf ;  \/\/\u8a2d\u8a08\u4e0d\u6eff\u610f\u4e3b\u8272? \u6c92\u95dc\u4fc2 \u96a8\u4fbf\u4f60\u6539\u5e7e\u6b21\u90fd\u53ef\u4ee5!\n--p-size: 24px; \/\/\u8001\u95c6\u8aaa\u8001\u82b1\u770b\u4e0d\u898b? \u6c92\u95dc\u4fc2 \u8b8a\u5927\u8b8a\u5c0f\u4e00\u6b21\u5b8c\u6210!\n}\nnav{ border-color: var(--mainColor); }\nh2{ color : var( --mainColor ); }\np{ font-size: var(--p-size) ; background-color : var( --mainColor ); }\n...\u4ee5\u6b64\u985e\u63a8<\/code><\/pre>\n\n\n\n<p>\u8d85\u65b9\u4fbf\u7684\u5427!!<br>RWD\u4e5f\u53ef\u4ee5\u8d85\u5feb\u5b8c\u6210!! \u53ea\u8981\u8907\u5beb\u8b8a\u6578\u7684\u503c\u84cb\u904e\u5c31\u597d:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>@media screen and (max-width:768px){\n :root{\n\u3000\u3000--p-size: 16px;\n\u3000\u3000--p-color: #dadada;\n\u3000}\n}<\/code><\/pre>\n\n\n\n<p>\u5dee\u4e0d\u591a\u5c31\u7d50\u675f\u4e86! \u4f60\u5b78\u6703\u4e86! (\u54a6)<\/p>\n<\/div>\n<\/div>\n\n\n\n<div class=\"wp-block-columns is-layout-flex wp-container-core-columns-is-layout-2 wp-block-columns-is-layout-flex\">\n<div class=\"wp-block-column has-background is-layout-flow wp-block-column-is-layout-flow\" style=\"background-color:#fff9ea;flex-basis:100%\">\n<p>\u70ba\u4e86\u907f\u514d\u4e00\u4e9b\u7591\u60d1\u7684\u7522\u751f\uff0c\u6211\u4f86\u505a\u4e00\u4e9b\u88dc\u5145:<br>\u95dc\u65bc\u8b8a\u6578\u5ba3\u544a\u7684\u4f4d\u7f6e\uff0c\u540c\u500b\u5340\u584a\u82e5\u5ba3\u544a\u5169\u6b21\u540c\u540d\u7684\u8b8a\u6578\uff0c\u6703\u4f9d\u64da\u6700\u5f8c\u4e00\u500b\u5ba3\u544a\u7684\u503c\u70ba\u6e96\u5594!<br>\u5373\u4f7f\u4f60\u628a\u8b8a\u6578\u5ba3\u544a\u5728\u5c6c\u6027\u5f8c\u4e5f\u4e00\u6a23!<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>.wrap{\n    color: var(--wrap-color,#000);\/\/\u653e\u5ba3\u544a\u8b8a\u6578\u524d\u9762\u9084\u662f\u5403\u7684\u5230\u503c\n    --wrap-color:#a298c7;\n}\n.wrap{  \n    background: var(--wrap-color);\/\/\u5403\u7684\u662f\u6700\u5f8c\u5ba3\u544a\u7684\u503c\n    --wrap-color:#726cbe; \/\/\u6c92\u7528\uff0c\u6703\u88ab\u4e0b\u500b\u540c\u540d\u84cb\u904e\u53bb\n    --wrap-color:#6cbe9f; \/\/\u4ee5\u9019\u500b\u503c\u70ba\u6e96\n}<\/code><\/pre>\n\n\n\n<p>\u5982\u679c\u9019\u6642.wrap\u88e1\u7684p\u4e5f\u5ba3\u544a\u4e86\u540c\u540d\u8b8a\u6578\u7684\u8a71\uff0cp\u672c\u8eab\u8207\u5b50\u5143\u7d20\u5403\u7684\u662fp\u88e1\u7684\u8b8a\u6578\u7684\u503c\u5594!<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>p{\n    --main-color:#ffffff; \/\/\u8b8a\u6210\u5340\u57df\u8b8a\u6578\uff0c\u4e5f\u4e0d\u5f71\u97ff\u540c\u6587\u4ef6\u88e1\u540c\u540d\u7684\u5168\u57df\u8b8a\u6578\n    color: var(--main-color);\n}<\/code><\/pre>\n\n\n\n<p>\u6211\u6709\u5beb\u7bc4\u4f8b\u653e\u5728codepen\uff1a<a href=\"https:\/\/codepen.io\/yukiyin\/pen\/jOwPEPM\">https:\/\/codepen.io\/yukiyin\/pen\/jOwPEPM<\/a><br>\u5be6\u969b\u770b\u5b8c\u6574\u7a0b\u5f0f\u78bc\u53ef\u4ee5\u52a0\u6df1\u7406\u89e3!<\/p>\n\n\n\n<p>\u53e6\u5916\uff0c\u8b8a\u6578\u7684\u66ff\u4ee3\u503c\uff0c\u4e5f\u6709\u4eba\u7a31\u9810\u8a2d\u503c\uff0c\u4f46mozilla\u662f\u7a31fallback value\u800c\u4e0d\u662fdefault\uff0c\u56e0\u70ba\u5982\u679c\u700f\u89bd\u5668(\u4f8b\u5982\u67d0E)\u4e0d\u652f\u6301CSS\u8b8a\u6578\u6642\uff0cfallback value\u662f\u4e0d\u8d77\u4f5c\u7528\u7684\u5594! 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