feat(language-switch): 语言切换

public/themes/dist_static/static/css/common.css

@@ -1196,7 +1196,10 @@ body {
   font-weight: 400;
   line-height: 1;
   white-space: nowrap;
-}.site-header__lang-active {
+}.site-header__lang-opt {
+  color: inherit;
+}
+.site-header__lang-active {
   color: rgb(175, 181, 185);
 }.site-header__search {
   display: flex;

public/themes/dist_static/static/js/common.js

@@ -102,6 +102,63 @@ $(function() {
 		$item.attr("data-expanded", String(!isExpanded));
 		$(this).attr("aria-expanded", String(!isExpanded));
 	});
+
+	// 语言切换：默认语言无前缀，其它语言用 /{lang}/ 前缀（与 getLang 一致）
+	(function initLangSwitch() {
+		const ALLOWED = ["zh", "tc", "en", "ja", "de", "fa", "id", "th", "ru"];
+		const defaultLang =
+			document.querySelector(".site-header__lang")?.getAttribute("data-lang-default") || "zh";
+
+		const getPathLang = () => {
+			const seg = location.pathname.replace(/^\//, "").split("/")[0] || "";
+			return ALLOWED.includes(seg) ? seg : defaultLang;
+		};
+
+		const buildLangUrl = (targetLang) => {
+			const parts = location.pathname.replace(/^\//, "").split("/").filter(Boolean);
+			if (parts.length && ALLOWED.includes(parts[0])) parts.shift();
+			const rest = parts.join("/");
+			let path;
+			if (!targetLang || targetLang === defaultLang) {
+				path = rest ? `/${rest}` : "/";
+			} else {
+				path = rest ? `/${targetLang}/${rest}` : `/${targetLang}/`;
+			}
+			return path + location.search + location.hash;
+		};
+
+		const goLang = (targetLang) => {
+			if (!targetLang) return;
+			const cur = getPathLang();
+			const uiCur = cur === "en" ? "en" : "zh";
+			if (targetLang === uiCur || targetLang === cur) return;
+			location.href = buildLangUrl(targetLang);
+		};
+
+		const syncActive = () => {
+			const uiLang = getPathLang() === "en" ? "en" : "zh";
+			$(".site-header__lang [data-lang]").removeClass("site-header__lang-active");
+			$(`.site-header__lang [data-lang="${uiLang}"]`).addClass("site-header__lang-active");
+		};
+
+		$(document).on("click", ".site-header__lang [data-lang]", function(e) {
+			e.preventDefault();
+			e.stopPropagation();
+			goLang(this.getAttribute("data-lang"));
+		});
+
+		$(document).on("click", ".site-header__lang", function(e) {
+			if ($(e.target).closest("[data-lang]").length) return;
+			goLang(getPathLang() === "en" ? "zh" : "en");
+		});
+
+		$(document).on("click", ".site-header__extra-btn.lang, .mask-header__icon-btn.lang", function(e) {
+			e.preventDefault();
+			goLang(getPathLang() === "en" ? "zh" : "en");
+		});
+
+		syncActive();
+	})();
 	// $(".section-contact-form").on("submit", function(e) {
 	// 	e.preventDefault();
 	// 	const $form = $(this);

public/themes/website/1/zh/demo/components/header.html

@@ -120,7 +120,18 @@
                 </span>
             </a>
         </div>
-        <button type="button" class="site-header__lang" aria-label="切换语言">
+        {php}
+          $hc_lang = function_exists('getLang') ? getLang() : 'zh';
+          $hc_default_lang = config('lang.default_lang') ?: 'zh';
+          $hc_lang_ui = ($hc_lang === 'en') ? 'en' : 'zh';
+        {/php}
+        <button
+            type="button"
+            class="site-header__lang"
+            aria-label="切换语言"
+            data-lang-default="{$hc_default_lang}"
+            data-lang-current="{$hc_lang}"
+        >
             <span class="site-header__icon" aria-hidden="true">
                 <svg
                     viewBox="0 0 16 16"
@@ -139,9 +150,9 @@
                     />
                 </svg>
             </span>
-            <span>EN</span>
+            <span class="site-header__lang-opt{if $hc_lang_ui=='en'} site-header__lang-active{/if}" data-lang="en">EN</span>
             <span>/</span>
-            <span class="site-header__lang-active">CN</span>
+            <span class="site-header__lang-opt{if $hc_lang_ui=='zh'} site-header__lang-active{/if}" data-lang="zh">CN</span>
         </button>
     </div>
     <div class="site-header__main">
@@ -499,7 +510,7 @@
             <a class="s-btn s-btn--primary site-header__cta" href="/contact.html">联系我们</a>
         </div>
         <div class="site-header__extras">
-            <button class="site-header__extra-btn lang" type="submit" aria-label="语言">
+            <button class="site-header__extra-btn lang" type="button" aria-label="切换语言">
                 <svg
                     viewBox="0 0 32 32"
                     xmlns="http://www.w3.org/2000/svg"