自定义颜色变量

src/style/base/theme/index.less

@@ -10,4 +10,33 @@
             @rule();
         }
     }
+}
+
+.setColor(@rule) {
+    .setColor(@rule[var], @rule[light], @rule[dark]);
+}
+
+.setColor(@var, @color) {
+    .setColor(@var, @color, @color);
+}
+
+.setColor(@var, @light, @dark) {
+    ._setColor({
+        @{var}: @light;
+    }, {
+        @{var}: @dark;
+    });
+}
+._setColor(@lightRule, @darkRule) {
+    body {
+        @lightRule();
+    }
+    body[data-weui-theme='dark'] {
+        @darkRule();
+    }
+    @media (prefers-color-scheme: dark) {
+        body:not([data-weui-theme='light']) {
+            @darkRule();
+        }
+    }
 }