{"id":8417,"date":"2019-01-26T00:51:45","date_gmt":"2019-01-25T16:51:45","guid":{"rendered":"https:\/\/www.zhangxinxu.com\/wordpress\/?p=8417"},"modified":"2019-01-30T17:00:10","modified_gmt":"2019-01-30T09:00:10","slug":"css-var-%e5%8f%98%e9%87%8f-%e5%b1%80%e9%83%a8","status":"publish","type":"post","link":"https:\/\/www.zhangxinxu.com\/wordpress\/2019\/01\/css-var-%e5%8f%98%e9%87%8f-%e5%b1%80%e9%83%a8\/","title":{"rendered":"CSS var\u53d8\u91cf\u7684\u5c40\u90e8\u4f5c\u7528\u57df\uff08\u7ee7\u627f\uff09\u7279\u6027"},"content":{"rendered":"<p>by <a href=\"https:\/\/www.zhangxinxu.com\/\">zhangxinxu<\/a> from <a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/?p=8417\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=8417<\/a><br \/>\n\u672c\u6587\u53ef\u5168\u6587\u8f6c\u8f7d\uff0c\u4e2a\u4eba\u7f51\u7ad9\u65e0\u9700\u6388\u6743\uff0c\u53ea\u8981\u4fdd\u7559\u539f\u4f5c\u8005\u3001\u51fa\u5904\u4ee5\u53ca\u6587\u4e2d\u94fe\u63a5\u5373\u53ef\uff0c\u4efb\u4f55\u7f51\u7ad9\u5747\u53ef\u6458\u8981\u805a\u5408\uff0c\u5546\u7528\u8bf7\u8054\u7cfb\u6388\u6743\u3002<br \/>\n<script>window.wxShareImgUrl = 'https:\/\/www.zhangxinxu.com\/study\/image\/share\/201901-css-var.jpg';<\/script><\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201811\/css-var-cover2.jpg\" width=\"484\" height=\"300\" class=\"alignright clip\" alt=\"CSS\u53d8\u91cfJS\u8bbe\u7f6e\u83b7\u53d6\u7f29\u7565\u56fe\"><\/p>\n<h3>\u4e00\u3001CSS\u53d8\u91cf\u975e\u5168\u5c40<\/h3>\n<p>\u6700\u8fd1\u505a\u9879\u76ee\uff0c\u53d1\u73b0CSS\u53d8\u91cf\u4e00\u4e2a\u6709\u610f\u601d\u7684\u7279\u6027\uff0c\u90a3\u5c31\u662f\u53d8\u91cf\u4f5c\u7528\u57df\u975e\u5168\u5c40\u3002<\/p>\n<p>\u4e3e\u4e2a\u4f8b\u5b50\uff0c\u5982\u4e0bHTML\u548cCSS\uff1a<\/p>\n<pre>&lt;div class=\"box\"&gt;\r\n    &lt;div class=\"a\"&gt;\u6d4b\u8bd5a&lt;\/div&gt;\r\n    &lt;div class=\"b\"&gt;\u6d4b\u8bd5b&lt;\/div&gt;\r\n    &lt;div class=\"c\"&gt;\u6d4b\u8bd5c&lt;\/div&gt;\r\n&lt;\/div&gt;<\/pre>\n<pre>.box {\r\n    --color: red;\r\n    color: var(--color);\r\n}\r\n.a {\r\n    --color: green;\r\n    color: var(--color);\r\n}\r\n.b {\r\n    --color: blue;\r\n    color: var(--color);\r\n}\r\n.c {\r\n    --color: yellow;\r\n}<\/pre>\n<p>\u867d\u7136\u6574\u4e2aCSS\u516c\u7528\u4e00\u4e2a\u4e0a\u4e0b\u6587\u6587\u6863\uff0c\u4f46\u662f\uff0c\u5bf9\u4e8eCSS\u53d8\u91cf\uff0c\u5374\u662f\u6709\u4f5c\u7528\u57df\u6982\u5ff5\u7684\uff0c\u53d8\u91cf\u53ea\u80fd\u4f5c\u7528\u4e8e\u81ea\u8eab\u4ee5\u53ca\u540e\u4ee3\u5143\u7d20\uff0c\u5144\u5f1f\u5143\u7d20\uff0c\u7956\u5148\u5143\u7d20\u90fd\u4e0d\u80fd\u4eab\u7528\u3002<\/p>\n<p>\u56e0\u6b64\uff0c\u8fd9\u91cc\u6700\u7ec8\u7684\u989c\u8272\u662f\uff1a\u7eff\u3001\u84dd\u548c\u7ea2\u3002\u5982\u4e0b\u622a\u56fe\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201901\/2019-01-26_000257.png\" width=\"206\" height=\"180\" alt=\"\u53d8\u91cf\u4e0e\u6587\u5b57\u989c\u8272\u622a\u56fe\" 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\/201901\/css-var-local-demo.php\" rel=\"noopener\" target=\"_blank\">CSS\u53d8\u91cf\u7684\u5c40\u90e8\u4f5c\u7528\u57df\u7279\u6027demo<\/a><\/p>\n<hr>\n<p>\u6240\u4ee5\uff0c\u5982\u679c\u4f60\u7684\u53d8\u91cf\u662f\u5168\u5c40\u4eab\u7528\u7684\uff0c\u5219\u5efa\u8bae\u653e\u5728<code>:root<\/code>\u4e0a\uff0c\u4f8b\u5982\uff1a<\/p>\n<pre>:root {\r\n    --color: red;\r\n}<\/pre>\n<p>\u5f53\u7136\uff0c\u4e5f\u53ef\u4ee5\u4f7f\u7528body\u6216\u8005html\u6807\u7b7e\uff1a<\/p>\n<pre>body {\r\n    --color: red;\r\n}<\/pre>\n<p>\u5982\u679c\u4f60\u7684\u53d8\u91cf\u662f\u5c40\u90e8\u4eab\u7528\u7684\uff0c\u5219\u8bbe\u7f6e\u5728\u6a21\u5757\u76d2\u5b50\u5143\u7d20\u4e0a\u5373\u53ef\u3002<\/p>\n<pre>.module {\r\n    --color: red;\r\n}<\/pre>\n<p>\u5b9e\u9645\u4e0a\uff0c\u629b\u5f00\u53d8\u91cf\u8fd9\u4e2a\u8bcd\u3002\u6211\u4eec\u53ef\u4ee5\u7406\u89e3\u4e3a\u5177\u6709\u7ee7\u627f\u7279\u6027\u7684\u81ea\u5b9a\u4e49CSS\u5c5e\u6027\u3002<\/p>\n<h3>\u4e8c\u3001CSS\u53d8\u91cf\u5c40\u90e8\u7279\u6027\u7528\u9014<\/h3>\n<p>\u7531\u4e8eCSS\u53d8\u91cf\u7684\u5c40\u90e8\u4f5c\u7528\u7279\u6027\uff0c\u4e8e\u662f\uff0c\u6211\u4eec\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u4f7f\u7528CSS\u53d8\u91cf\u7ed9\u4f2a\u5143\u7d20\u4f20\u53c2\u4e86\u3002<\/p>\n<p>\u4f8b\u5982\uff0c\u4e00\u4e2a\u591a\u56fe\u4e0a\u4f20\u9875\u9762\uff0c\u6709\u5f88\u591aloading\u8fdb\u5ea6\u6761\uff0c\u6b64\u65f6\uff0c\u5c31\u53ef\u4ee5\u4f7f\u7528CSS\u53d8\u91cf\u5c06\u52a0\u8f7d\u8fdb\u5ea6\u4f20\u7ed9\u4f2a\u5143\u7d20\uff0c\u8fd9\u6837\uff0c\u4e00\u4e2a\u6807\u7b7e\u5c31\u80fd\u5b9e\u73b0\u5b8c\u6574\u7684\u8fdb\u5ea6\u6548\u679c\u4e86\uff0c\u4ee3\u7801\u7b80\u6d01\u53c8\u9ad8\u6548\uff0c\u800c\u5728\u8fc7\u53bb\uff0c\u6211\u4eec\u4e00\u5b9a\u8981\u5d4c\u5957HTML\u6807\u7b7e\u624d\u80fd\u5b9e\u73b0\u3002HTML\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>&lt;label&gt;\u56fe\u72471\uff1a&lt;\/label&gt;\r\n&lt;div class=\"bar\" <span style=\"color:#cd0000;\">style=\"--percent: 60;\"<\/span>&gt;&lt;\/div&gt;\r\n&lt;label&gt;\u56fe\u72472\uff1a&lt;\/label&gt;\r\n&lt;div class=\"bar\" <span style=\"color:#cd0000;\">style=\"--percent: 40;\"<\/span>&gt;&lt;\/div&gt;\r\n&lt;label&gt;\u56fe\u72473\uff1a&lt;\/label&gt;\r\n&lt;div class=\"bar\" <span style=\"color:#cd0000;\">style=\"--percent: 20;\"<\/span>&gt;&lt;\/div&gt;<\/pre>\n<p>\u6211\u4eec\u53ea\u9700\u8981\u5728style\u5c5e\u6027\u4e2d\u66f4\u65b0\u5f53\u524d\u4e0a\u4f20\u8fdb\u5ea6\u53d8\u91cf\u5c31\u53ef\u4ee5\u4e86\u3002<\/p>\n<p>\u7136\u540e\uff0c\u6211\u4eec\u5c31\u53ef\u4ee5\u628a\u8fd9\u4e2a\u53d8\u91cf\u8f6c\u6362\u6210\u6211\u4eec\u9700\u8981\u7684\u4f2a\u5143\u7d20\u6570\u503c\u4ee5\u53ca\u5bbd\u5ea6\u5927\u5c0f\uff0cCSS\u4ee3\u7801\u5982\u4e0b\uff1a<\/p>\n<pre>.bar {\r\n    height: 20px; width: 300px;\r\n    background-color: #f5f5f5;\r\n}\r\n.bar::before {\r\n    counter-reset: progress var(--percent);\r\n    content: counter(progress) '%\\2002';\r\n    display: block;\r\n    width: calc(300px * var(--percent) \/ 100);\r\n    font-size: 12px;\r\n    color: #fff;\r\n    background-color: #2486ff;\r\n    text-align: right;\r\n    white-space: nowrap;\r\n    overflow: hidden;\r\n}<\/pre>\n<p>CSS\u8fb9\u6846\u6570\u503c\u53ef\u4ee5\u8bb0\u4f4f<code>counter<\/code>\u8ba1\u6570\u5668\u5448\u73b0\uff0c\u5bf9\u8ba1\u6570\u5668\u8fd8\u4e0d\u4e86\u89e3\u7684\u53ef\u4ee5\u53c2\u89c1\u201c<a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2014\/08\/css-counters-automatic-number-content\/\" rel=\"noopener\" target=\"_blank\">CSS counter\u8ba1\u6570\u5668(content\u76ee\u5f55\u5e8f\u53f7\u81ea\u52a8\u9012\u589e)\u8be6\u89e3<\/a>\u201d\u8fd9\u7bc7\u6587\u7ae0\uff0c\u5728<a href=\"http:\/\/www.epubit.com.cn\/book\/details\/4767\" rel=\"noopener\" target=\"_blank\">\u300aCSS\u4e16\u754c\u300b<\/a>\u8fd9\u672c\u4e66\u4e2d\u4e5f\u6709\u8be6\u7ec6\u4ecb\u7ecd\u3002<\/p>\n<p>\u5bbd\u5ea6\u5219\u53ef\u4ee5\u501f\u52a9<code>calc()<\/code>\u8f6c\u6362\u6210\u5e26<code>px<\/code>\u7684\u503c\u3002\u5176\u5b83\u4e00\u4e9b\u5b9e\u73b0\u7ec6\u8282\u4e0d\u5c55\u5f00\uff0c\u6709\u7591\u95ee\u53ef\u4ee5\u8bc4\u8bba\uff0c\u6211\u4f1a\u89e3\u7b54\u3002\u6700\u7ec8\u5b9e\u73b0\u7684\u6548\u679c\u5982\u4e0b\u56fe\u6240\u793a\uff1a<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201901\/2019-01-26_003635.png\" width=\"440\" height=\"280\" alt=\"\u5355\u6807\u7b7e\u4e0e\u53d8\u91cf\u5b9e\u73b0\u7684\u4e0a\u4f20\u8fdb\u5ea6\u6761\u6548\u679c\" class=\"alignnone size-medium\" \/><\/p>\n<p>\u6709demo\uff0c\u60a8\u53ef\u4ee5\u72e0\u72e0\u5730\u70b9\u51fb\u8fd9\u91cc\uff1a<a href=\"https:\/\/www.zhangxinxu.com\/study\/201901\/css-var-progress-bar-demo.php\" rel=\"noopener\" target=\"_blank\">CSS\u53d8\u91cf\u4e0e\u4e0a\u4f20\u8fdb\u5ea6\u6761demo<\/a><\/p>\n<p>\u53ef\u89c1\uff0cCSS\u4e5f\u8d8a\u6765\u8d8a\u5177\u6709\u52a8\u6001\u7279\u6027\u4e86\u3002<\/p>\n<h3>\u4e09\u3001\u7ed3\u675f\u8bed<\/h3>\n<p>CSS\u53d8\u91cf\u5c31\u50cfJS\u7684\u53d8\u91cf\uff0c\u6bcf\u4e2a\u7c7b\u540d\u6216\u8005\u82b1\u62ec\u53f7\u5c31\u50cf\u4e00\u4e2a<code>function<\/code>\uff0c\u91cc\u9762\u7684\u53d8\u91cf\u53ea\u6709\u4e0a\u4e0b\u6587\u4ee5\u5185\u53ef\u4ee5\u83b7\u53d6\uff0c\u8fd9\u5c31\u8ba9CSS\u6709\u4e86\u66f4\u591a\u53ef\u80fd\u6027\u3002\u5916\u90e8\u53d8\u91cf\u7a0d\u5fae\u4e00\u8fb9\uff0c\u6574\u4e2aCSS\u90fd\u53ef\u4ee5\u5927\u5927\u8054\u52a8\uff0c\u4e14\u662f\u5b9e\u65f6\u7684\uff0c\u5f88\u6709\u610f\u601d\uff0c\u53ef\u4ee5\u73a9\u7684\u4e1c\u897f\u5f88\u591a\u3002\u4e0d\u8fc7\u8fd9\u91cc\u6682\u4e0d\u5c55\u5f00\uff0c\u56e0\u4e3a\u56f0\u4e86\uff0c\u660e\u65e9\u8fd8\u6709\u76f4\u64ad\u3002<\/p>\n<p>\u9644\u4e0a\u4e4b\u524d\u5199\u7684\u5173\u4e8eCSS3\u53d8\u91cf\u7684\u4e24\u4e2atip\u6587\u7ae0\uff1a<\/p>\n<ul>\n<li><a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2016\/11\/css-css3-variables-var\/\" rel=\"noopener\">\u5c0ftips:\u4e86\u89e3CSS\/CSS3\u539f\u751f\u53d8\u91cfvar<\/a><\/li>\n<li><a href=\"https:\/\/www.zhangxinxu.com\/wordpress\/2018\/11\/html-js-set-css-css3-var%e5%8f%98%e9%87%8f\/\">\u5c0ftips: \u5982\u4f55HTML\u6807\u7b7e\u548cJS\u4e2d\u8bbe\u7f6eCSS3 var\u53d8\u91cf<\/a><\/li>\n<\/ul>\n<p>\u5c31\u8fd9\u4e9b\uff0c\u611f\u8c22\u9605\u8bfb\uff01<\/p>\n<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/emtion\/emoji\/1f60e.svg\" width=\"20\" height=\"20\" align=\"absmiddle\"><\/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=8417\">https:\/\/www.zhangxinxu.com\/wordpress\/?p=8417<\/a><\/p>\n<p>\uff08\u672c\u7bc7\u5b8c\uff09<\/p>\n","protected":false},"excerpt":{"rendered":"<p><img loading=\"lazy\" decoding=\"async\" src=\"\/\/image.zhangxinxu.com\/image\/blog\/201811\/css-var-cover2.jpg\" width=\"161\" height=\"100\" lazyload=\"on\" class=\"alignright\" alt=\"CSS\u53d8\u91cf\u7f29\u7565\u56fe\"><\/p>\n<p>\u6700\u8fd1\u505a\u9879\u76ee\uff0c\u53d1\u73b0CSS\u53d8\u91cf\u4e00\u4e2a\u6709\u610f\u601d\u7684\u7279\u6027\uff0c\u90a3\u5c31\u662f\u53d8\u91cf\u4f5c\u7528\u57df\u975e\u5168\u5c40\uff0c\u4e8e\u662f\uff0c\u6211\u4eec\u53ef\u4ee5\u653e\u5fc3\u5927\u80c6\u4f7f\u7528CSS\u53d8\u91cf\u7ed9\u4f2a\u5143\u7d20\u4f20\u53c2\u4e86\u3002\u8fd9\u6837\uff0c\u4ee5\u524d\u4e00\u4e9b\u5f88\u5570\u55e6\u7684\u5b9e\u73b0\u73b0\u5728\u5c31\u53ef\u4ee5\u53d8\u5f97\u975e\u5e38\u7b80\u6d01\u3002<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[3],"tags":[971,938,177,1271,780,1089,503,1009],"_links":{"self":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/8417"}],"collection":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/comments?post=8417"}],"version-history":[{"count":0,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/posts\/8417\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/media?parent=8417"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/categories?post=8417"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.zhangxinxu.com\/wordpress\/wp-json\/wp\/v2\/tags?post=8417"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}