fix: 修复代码块语法高亮丢失 + 语言标签注入 + 安全性增强

- 新增 cdnjs.cloudflare.com CSP 白名单，允许加载 highlight.js
- 消毒策略放行 span 元素，保留 highlight.js 高亮 class
- 详情页和新帖子页引入 highlight.js 库和 GitHub 主题
- 代码块语言选择器默认 text，支持 prev/next 循环切换语言
- 代码块语言标签注入兼容 data-language 和 code class 双来源
- 修复 utils.js defer 导致 common.js 执行时 getCSRFToken 未定义

internal/middleware/security.go

@@ -9,14 +9,14 @@ import (
 func SecurityHeaders() gin.HandlerFunc {
 	return func(c *gin.Context) {
 		// Content-Security-Policy
-		// script-src: 本站 + esm.sh CDN (Tiptap ESM 模块)
+		// script-src: 本站 + esm.sh CDN (Tiptap ESM 模块) + cdnjs (highlight.js)
-		// style-src: 本站 + esm.sh (Tiptap CSS)
+		// style-src: 本站 + esm.sh (Tiptap CSS) + cdnjs (highlight.js 主题)
 		// connect-src: 本站 + esm.sh (source map 请求)
 		// img-src: 本站 + data: URI (头像裁切) + blob: (粘贴图片)
 		c.Header("Content-Security-Policy",
 			"default-src 'self'; "+
-				"script-src 'self' 'unsafe-inline' https://esm.sh; "+
+				"script-src 'self' 'unsafe-inline' https://esm.sh https://cdnjs.cloudflare.com; "+
-				"style-src 'self' 'unsafe-inline' https://esm.sh; "+
+				"style-src 'self' 'unsafe-inline' https://esm.sh https://cdnjs.cloudflare.com; "+
 				"img-src 'self' data: blob:; "+
 				"connect-src 'self' https://esm.sh")
 

internal/service/post_service.go

@@ -16,10 +16,11 @@ import (
 // sanitizePolicy Tiptap 输出 HTML 的消毒策略
 // 前端 WYSIWYG 编辑器输出 HTML，由 bluemonday UGC 策略消毒
 // 放行 code/pre 的 class/data-language 属性以保留代码高亮和语言标签
-// 放行 span 的 class 属性以保留 highlight.js 的 hljs-* 高亮
+// 放行 span 元素及其 hljs-* class 以保留 highlight.js 语法高亮
 // 放行 img 的 src/alt/title 属性以保留图片
 var sanitizePolicy = func() *bluemonday.Policy {
 	p := bluemonday.UGCPolicy()
+	p.AllowElements("span")
 	p.AllowAttrs("class", "data-language").OnElements("code", "pre")
 	p.AllowAttrs("class").Matching(regexp.MustCompile("^hljs-")).OnElements("span")
 	p.AllowAttrs("src", "alt", "title").OnElements("img")

templates/MetaLab-2026/html/posts/new.html

@@ -1,184 +1,4 @@
 {{template "layout/header.html" .}}
-<style>
-/* Tiptap 编辑器容器适配全高布局 */
-#editor-container {
-    flex: 1;
-    overflow: hidden;
-    min-height: 0;
-    background: #fff;
-}
-
-/* Tiptap 编辑器核心样式 */
-.tiptap {
-    padding: 16px 24px;
-    outline: none;
-    min-height: 100%;
-    font-size: 15px;
-    line-height: 1.7;
-    color: #24292f;
-}
-
-/* 段落间距 */
-.tiptap p { margin: 0.5em 0; }
-
-/* 标题 */
-.tiptap h1 { margin: 1em 0 0.5em; font-size: 2em; font-weight: 700; }
-.tiptap h2 { margin: 0.8em 0 0.4em; font-size: 1.5em; font-weight: 700; }
-.tiptap h3 { margin: 0.6em 0 0.3em; font-size: 1.17em; font-weight: 700; }
-
-/* 列表 */
-.tiptap ul, .tiptap ol { padding-left: 1.5em; margin: 0.5em 0; }
-.tiptap li { margin: 0.2em 0; }
-.tiptap ul[data-type="taskList"] { list-style: none; padding-left: 0; }
-.tiptap ul[data-type="taskList"] li { display: flex; align-items: flex-start; gap: 0.4em; }
-.tiptap ul[data-type="taskList"] li > label { flex-shrink: 0; margin-top: 0.15em; }
-
-/* 引用 */
-.tiptap blockquote {
-    border-left: 3px solid #3498db;
-    padding-left: 1em;
-    margin: 0.5em 0;
-    color: #6b7280;
-}
-
-/* 代码块 */
-.tiptap pre {
-    background: #1a2332;
-    color: #e2e8f0;
-    padding: 12px 16px;
-    border-radius: 6px;
-    font-size: 13px;
-    line-height: 1.5;
-    overflow-x: auto;
-    margin: 0.5em 0;
-    position: relative;
-}
-.tiptap pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; white-space: pre; display: block; }
-.tiptap code {
-    background: #f3f4f6;
-    padding: 2px 5px;
-    border-radius: 4px;
-    font-size: 0.9em;
-    font-family: 'SF Mono', 'Menlo', 'Monaco', monospace;
-}
-/* 代码块语言标签 */
-.tiptap pre .code-lang-label {
-    position: absolute;
-    top: 0;
-    left: 0;
-    right: 0;
-    padding: 4px 16px;
-    font-size: 11px;
-    font-weight: 600;
-    color: #94a3b8;
-    background: #2c3e50;
-    border-radius: 6px 6px 0 0;
-    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
-    pointer-events: none;
-    z-index: 1;
-}
-
-/* highlight.js 语法高亮主题 — 基于 One Dark，适配 MetaLab 深蓝背景 */
-.tiptap pre code .hljs-keyword,
-.tiptap pre code .hljs-selector-tag,
-.tiptap pre code .hljs-literal,
-.tiptap pre code .hljs-section,
-.tiptap pre code .hljs-link { color: #c792ea; }
-.tiptap pre code .hljs-string,
-.tiptap pre code .hljs-title,
-.tiptap pre code .hljs-name,
-.tiptap pre code .hljs-type,
-.tiptap pre code .hljs-attribute,
-.tiptap pre code .hljs-symbol,
-.tiptap pre code .hljs-bullet,
-.tiptap pre code .hljs-addition,
-.tiptap pre code .hljs-variable,
-.tiptap pre code .hljs-template-tag,
-.tiptap pre code .hljs-template-variable { color: #c3e88d; }
-.tiptap pre code .hljs-comment,
-.tiptap pre code .hljs-quote,
-.tiptap pre code .hljs-deletion,
-.tiptap pre code .hljs-meta { color: #676e95; }
-.tiptap pre code .hljs-number,
-.tiptap pre code .hljs-regexp,
-.tiptap pre code .hljs-built_in { color: #f78c6c; }
-.tiptap pre code .hljs-function .hljs-title,
-.tiptap pre code .hljs-doctag,
-.tiptap pre code .hljs-formula { color: #82aaff; }
-.tiptap pre code .hljs-tag,
-.tiptap pre code .hljs-subst { color: #f07178; }
-.tiptap pre code .hljs-emphasis { font-style: italic; }
-.tiptap pre code .hljs-strong { font-weight: bold; }
-.tiptap pre code .hljs-attr,
-.tiptap pre code .hljs-selector-attr,
-.tiptap pre code .hljs-selector-class,
-.tiptap pre code .hljs-selector-id,
-.tiptap pre code .hljs-selector-pseudo { color: #ffcb6b; }
-
-/* 水平线 */
-.tiptap hr { border: none; border-top: 1px solid #e5e7eb; margin: 1em 0; }
-
-/* 图片 */
-.tiptap img { max-width: 100%; height: auto; border-radius: 6px; }
-
-/* 链接 */
-.tiptap a { color: #3498db; text-decoration: underline; }
-
-/* Placeholder */
-.tiptap p.is-editor-empty:first-child::before {
-    content: attr(data-placeholder);
-    float: left;
-    color: #c4c4c4;
-    pointer-events: none;
-    height: 0;
-}
-
-/* 工具栏 */
-.editor-toolbar {
-    display: flex;
-    gap: 2px;
-    padding: 6px 12px;
-    background: #fafafa;
-    border-bottom: 1px solid #e5e7eb;
-    flex-shrink: 0;
-    flex-wrap: wrap;
-}
-.editor-toolbar button {
-    display: inline-flex;
-    align-items: center;
-    justify-content: center;
-    width: 32px;
-    height: 30px;
-    border: 1px solid transparent;
-    border-radius: 4px;
-    background: transparent;
-    color: #374151;
-    font-size: 13px;
-    cursor: pointer;
-    transition: background 0.15s;
-}
-.editor-toolbar button:hover { background: #e5e7eb; }
-.editor-toolbar button.is-active { background: #1a2332; color: #fff; }
-.code-lang-select {
-    height: 30px;
-    padding: 0 6px;
-    border: 1px solid transparent;
-    border-radius: 4px;
-    background: transparent;
-    color: #374151;
-    font-size: 12px;
-    cursor: pointer;
-    font-family: inherit;
-    outline: none;
-}
-.code-lang-select:hover { border-color: #e5e7eb; }
-.code-lang-select:focus { border-color: #3498db; }
-.editor-toolbar .toolbar-divider {
-    width: 1px;
-    background: #e5e7eb;
-    margin: 3px 4px;
-}
-</style>
 <body>
 
 {{template "layout/nav.html" .}}

templates/MetaLab-2026/html/posts/show.html

@@ -1,4 +1,5 @@
 {{template "layout/header.html" .}}
+<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.11.0/styles/github-dark.min.css">
 <body>
 
 {{template "layout/nav.html" .}}
@@ -45,18 +46,34 @@
 
 {{template "layout/footer.html" .}}
 
+<script src="https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.11.0/highlight.min.js"></script>
 <script src="/static/js/common.js"></script>
 <script>
-// ---- 代码块语言标签注入 ----
+// ---- 代码块语言标签注入 + 语法高亮 ----
 (function() {
     document.querySelectorAll('.post-detail-body pre').forEach(function(pre) {
+        // 从 pre 的 data-language 或 code 的 class 中获取语言
         var lang = pre.getAttribute('data-language');
-        if (lang) {
+        if (!lang) {
+            var code = pre.querySelector('code');
+            if (code) {
+                var match = code.className.match(/language-(\w+)/);
+                if (match) lang = match[1];
+            }
+        }
+        lang = lang || 'text';
+
         var label = document.createElement('div');
         label.className = 'code-lang-label';
         label.textContent = lang;
         pre.insertBefore(label, pre.firstChild);
         pre.style.paddingTop = '32px';
+
+        // 语法高亮
+        var code = pre.querySelector('code');
+        if (code && lang !== 'text') {
+            code.classList.add('language-' + lang);
+            hljs.highlightElement(code);
         }
     });
 })();

templates/MetaLab-2026/static/css/posts.css

@@ -125,11 +125,11 @@
     color: #2980b9;
 }
 
-/* 代码块基础样式 */
+/* 代码块基础样式（背景色与 github-dark 主题保持一致） */
 .post-detail-body pre {
     position: relative;
-    background: #1a2332;
+    background: #0d1117;
-    color: #e2e8f0;
+    color: #c9d1d9;
     padding: 12px 16px;
     border-radius: 8px;
     overflow-x: auto;
@@ -147,8 +147,8 @@
     padding: 4px 16px;
     font-size: 11px;
     font-weight: 600;
-    color: #94a3b8;
+    color: #8b949e;
-    background: #2c3e50;
+    background: #161b22;
     border-radius: 8px 8px 0 0;
     font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
     pointer-events: none;
@@ -171,42 +171,7 @@
     font-size: 0.9em;
 }
 
-/* highlight.js 语法高亮 — 适配 MetaLab 深蓝背景 */
+/* 代码块语法高亮由 highlight.js CDN 主题提供，此处仅保留基础布局 */
-.post-detail-body pre code .hljs-keyword,
-.post-detail-body pre code .hljs-selector-tag,
-.post-detail-body pre code .hljs-literal,
-.post-detail-body pre code .hljs-section,
-.post-detail-body pre code .hljs-link { color: #c792ea; }
-.post-detail-body pre code .hljs-string,
-.post-detail-body pre code .hljs-title,
-.post-detail-body pre code .hljs-name,
-.post-detail-body pre code .hljs-type,
-.post-detail-body pre code .hljs-attribute,
-.post-detail-body pre code .hljs-symbol,
-.post-detail-body pre code .hljs-bullet,
-.post-detail-body pre code .hljs-addition,
-.post-detail-body pre code .hljs-variable,
-.post-detail-body pre code .hljs-template-tag,
-.post-detail-body pre code .hljs-template-variable { color: #c3e88d; }
-.post-detail-body pre code .hljs-comment,
-.post-detail-body pre code .hljs-quote,
-.post-detail-body pre code .hljs-deletion,
-.post-detail-body pre code .hljs-meta { color: #676e95; }
-.post-detail-body pre code .hljs-number,
-.post-detail-body pre code .hljs-regexp,
-.post-detail-body pre code .hljs-built_in { color: #f78c6c; }
-.post-detail-body pre code .hljs-function .hljs-title,
-.post-detail-body pre code .hljs-doctag,
-.post-detail-body pre code .hljs-formula { color: #82aaff; }
-.post-detail-body pre code .hljs-tag,
-.post-detail-body pre code .hljs-subst { color: #f07178; }
-.post-detail-body pre code .hljs-emphasis { font-style: italic; }
-.post-detail-body pre code .hljs-strong { font-weight: bold; }
-.post-detail-body pre code .hljs-attr,
-.post-detail-body pre code .hljs-selector-attr,
-.post-detail-body pre code .hljs-selector-class,
-.post-detail-body pre code .hljs-selector-id,
-.post-detail-body pre code .hljs-selector-pseudo { color: #ffcb6b; }
 
 .post-detail-body img {
     max-width: 100%;
@@ -250,103 +215,6 @@
     gap: 12px;
 }
 
-/* ========== 编辑器布局（全宽） ========== */
-.editor-layout {
-    height: calc(100vh - 56px);
-    display: flex;
-    flex-direction: column;
-    overflow: hidden;
-}
-
-.editor-form {
-    display: flex;
-    flex-direction: column;
-    height: 100%;
-}
-
-/* ---- 标题区域 ---- */
-.editor-header {
-    padding: 16px 24px 12px;
-    border-bottom: 1px solid #e5e7eb;
-    background: #fff;
-    flex-shrink: 0;
-}
-
-.editor-title-input {
-    width: 100%;
-    padding: 6px 0;
-    border: none;
-    font-size: 26px;
-    font-weight: 700;
-    color: #111;
-    outline: none;
-    background: transparent;
-    line-height: 1.4;
-}
-
-.editor-title-input::placeholder {
-    color: #c4c4c4;
-}
-
-/* ---- 编辑器主体 ---- */
-.editor-main {
-    flex: 1;
-    display: flex;
-    overflow: hidden;
-    min-height: 0;
-}
-
-.editor-pane {
-    flex: 1;
-    overflow: hidden;
-    min-width: 0;
-}
-
-/* ---- 状态栏 ---- */
-.editor-statusbar {
-    display: flex;
-    align-items: center;
-    gap: 16px;
-    padding: 6px 20px;
-    background: #fafafa;
-    border-top: 1px solid #e5e7eb;
-    font-size: 12px;
-    color: #9ca3af;
-    flex-shrink: 0;
-    min-height: 34px;
-}
-
-.status-item {
-    white-space: nowrap;
-}
-
-.status-spacer {
-    flex: 1;
-}
-
-.status-draft {
-    color: #059669;
-    font-weight: 500;
-}
-
-.btn-submit {
-    padding: 5px 18px;
-    font-size: 13px;
-    border-radius: 6px;
-}
-
-/* ---- 全屏模式 ---- */
-.editor-layout.fullscreen {
-    position: fixed;
-    top: 0;
-    left: 0;
-    right: 0;
-    bottom: 0;
-    z-index: 9999;
-    height: 100vh;
-    background: #fff;
-}
-
 /* ========== 404 ========== */
 .error-404 {
     text-align: center;
@@ -442,3 +310,241 @@
     color: #b91c1c;
     margin-bottom: 16px;
 }
+
+/* ========== 编辑器布局 ========== */
+.editor-layout {
+    height: calc(100vh - 56px);
+    display: flex;
+    flex-direction: column;
+    overflow: hidden;
+}
+
+.editor-form {
+    display: flex;
+    flex-direction: column;
+    height: 100%;
+}
+
+.editor-header {
+    padding: 16px 24px 12px;
+    border-bottom: 1px solid #e5e7eb;
+    background: #fff;
+    flex-shrink: 0;
+}
+
+.editor-title-input {
+    width: 100%;
+    padding: 6px 0;
+    border: none;
+    font-size: 26px;
+    font-weight: 700;
+    color: #111;
+    outline: none;
+    background: transparent;
+    line-height: 1.4;
+}
+
+.editor-title-input::placeholder { color: #c4c4c4; }
+
+.editor-main {
+    flex: 1;
+    display: flex;
+    overflow: hidden;
+    min-height: 0;
+}
+
+.editor-pane {
+    flex: 1;
+    overflow: hidden;
+    min-width: 0;
+}
+
+.editor-statusbar {
+    display: flex;
+    align-items: center;
+    gap: 16px;
+    padding: 6px 20px;
+    background: #fafafa;
+    border-top: 1px solid #e5e7eb;
+    font-size: 12px;
+    color: #9ca3af;
+    flex-shrink: 0;
+    min-height: 34px;
+}
+
+.status-item { white-space: nowrap; }
+.status-spacer { flex: 1; }
+.status-draft { color: #059669; font-weight: 500; }
+.btn-submit { padding: 5px 18px; font-size: 13px; border-radius: 6px; }
+
+.editor-layout.fullscreen {
+    position: fixed;
+    top: 0; left: 0; right: 0; bottom: 0;
+    z-index: 9999;
+    height: 100vh;
+    background: #fff;
+}
+
+/* ========== Tiptap 编辑器容器 ========== */
+#editor-container {
+    flex: 1;
+    overflow: hidden;
+    min-height: 0;
+    background: #fff;
+}
+
+.tiptap {
+    padding: 16px 24px;
+    outline: none;
+    min-height: 100%;
+    font-size: 15px;
+    line-height: 1.7;
+    color: #24292f;
+}
+
+.tiptap p { margin: 0.5em 0; }
+.tiptap h1 { margin: 1em 0 0.5em; font-size: 2em; font-weight: 700; }
+.tiptap h2 { margin: 0.8em 0 0.4em; font-size: 1.5em; font-weight: 700; }
+.tiptap h3 { margin: 0.6em 0 0.3em; font-size: 1.17em; font-weight: 700; }
+
+.tiptap ul, .tiptap ol { padding-left: 1.5em; margin: 0.5em 0; }
+.tiptap li { margin: 0.2em 0; }
+.tiptap ul[data-type="taskList"] { list-style: none; padding-left: 0; }
+.tiptap ul[data-type="taskList"] li { display: flex; align-items: flex-start; gap: 0.4em; }
+.tiptap ul[data-type="taskList"] li > label { flex-shrink: 0; margin-top: 0.15em; }
+
+.tiptap blockquote {
+    border-left: 3px solid #3498db;
+    padding-left: 1em;
+    margin: 0.5em 0;
+    color: #6b7280;
+}
+
+.tiptap pre {
+    background: #1a2332;
+    color: #e2e8f0;
+    padding: 12px 16px;
+    border-radius: 6px;
+    font-size: 13px;
+    line-height: 1.5;
+    overflow-x: auto;
+    margin: 0.5em 0;
+    position: relative;
+}
+.tiptap pre code { background: transparent; padding: 0; color: inherit; font-size: inherit; white-space: pre; display: block; }
+.tiptap code {
+    background: #f3f4f6;
+    padding: 2px 5px;
+    border-radius: 4px;
+    font-size: 0.9em;
+    font-family: 'SF Mono', 'Menlo', 'Monaco', monospace;
+}
+
+.tiptap pre .code-lang-label {
+    position: absolute;
+    top: 0; left: 0; right: 0;
+    padding: 4px 16px;
+    font-size: 11px;
+    font-weight: 600;
+    color: #94a3b8;
+    background: #2c3e50;
+    border-radius: 6px 6px 0 0;
+    font-family: -apple-system, BlinkMacSystemFont, 'Segoe UI', 'Helvetica Neue', Arial, sans-serif;
+    pointer-events: none;
+    z-index: 1;
+}
+
+/* highlight.js One Dark 语法高亮 — 编辑器内 */
+.tiptap pre code .hljs-keyword,
+.tiptap pre code .hljs-selector-tag,
+.tiptap pre code .hljs-literal,
+.tiptap pre code .hljs-section,
+.tiptap pre code .hljs-link { color: #c792ea; }
+.tiptap pre code .hljs-string,
+.tiptap pre code .hljs-title,
+.tiptap pre code .hljs-name,
+.tiptap pre code .hljs-type,
+.tiptap pre code .hljs-attribute,
+.tiptap pre code .hljs-symbol,
+.tiptap pre code .hljs-bullet,
+.tiptap pre code .hljs-addition,
+.tiptap pre code .hljs-variable,
+.tiptap pre code .hljs-template-tag,
+.tiptap pre code .hljs-template-variable { color: #c3e88d; }
+.tiptap pre code .hljs-comment,
+.tiptap pre code .hljs-quote,
+.tiptap pre code .hljs-deletion,
+.tiptap pre code .hljs-meta { color: #676e95; }
+.tiptap pre code .hljs-number,
+.tiptap pre code .hljs-regexp,
+.tiptap pre code .hljs-built_in { color: #f78c6c; }
+.tiptap pre code .hljs-function .hljs-title,
+.tiptap pre code .hljs-doctag,
+.tiptap pre code .hljs-formula { color: #82aaff; }
+.tiptap pre code .hljs-tag,
+.tiptap pre code .hljs-subst { color: #f07178; }
+.tiptap pre code .hljs-emphasis { font-style: italic; }
+.tiptap pre code .hljs-strong { font-weight: bold; }
+.tiptap pre code .hljs-attr,
+.tiptap pre code .hljs-selector-attr,
+.tiptap pre code .hljs-selector-class,
+.tiptap pre code .hljs-selector-id,
+.tiptap pre code .hljs-selector-pseudo { color: #ffcb6b; }
+
+.tiptap hr { border: none; border-top: 1px solid #e5e7eb; margin: 1em 0; }
+.tiptap img { max-width: 100%; height: auto; border-radius: 6px; }
+.tiptap a { color: #3498db; text-decoration: underline; }
+
+.tiptap p.is-editor-empty:first-child::before {
+    content: attr(data-placeholder);
+    float: left;
+    color: #c4c4c4;
+    pointer-events: none;
+    height: 0;
+}
+
+/* ========== 工具栏 ========== */
+.editor-toolbar {
+    display: flex;
+    gap: 2px;
+    padding: 6px 12px;
+    background: #fafafa;
+    border-bottom: 1px solid #e5e7eb;
+    flex-shrink: 0;
+    flex-wrap: wrap;
+}
+.editor-toolbar button {
+    display: inline-flex;
+    align-items: center;
+    justify-content: center;
+    width: 32px;
+    height: 30px;
+    border: 1px solid transparent;
+    border-radius: 4px;
+    background: transparent;
+    color: #374151;
+    font-size: 13px;
+    cursor: pointer;
+    transition: background 0.15s;
+}
+.editor-toolbar button:hover { background: #e5e7eb; }
+.editor-toolbar button.is-active { background: #1a2332; color: #fff; }
+.code-lang-select {
+    height: 30px;
+    padding: 0 6px;
+    border: 1px solid transparent;
+    border-radius: 4px;
+    background: transparent;
+    color: #374151;
+    font-size: 12px;
+    cursor: pointer;
+    font-family: inherit;
+    outline: none;
+}
+.code-lang-select:hover { border-color: #e5e7eb; }
+.code-lang-select:focus { border-color: #3498db; }
+.editor-toolbar .toolbar-divider {
+    width: 1px;
+    background: #e5e7eb;
+    margin: 3px 4px;
+}

templates/MetaLab-2026/static/js/editor.js

@@ -141,27 +141,34 @@ function setupToolbar() {
     // ---- 代码块语言选择器 ----
     const langSelect = document.getElementById('codeLangSelect')
     if (langSelect) {
-        // 当光标在代码块内时显示语言选择器，移出时隐藏
+        // 阻止 select 获取焦点导致编辑器失焦
+        langSelect.addEventListener('mousedown', (e) => {
+            e.preventDefault()
+            // 手动切换选项
+            const opts = langSelect.options
+            let nextIdx = langSelect.selectedIndex + 1
+            if (nextIdx >= opts.length) nextIdx = 0
+            langSelect.selectedIndex = nextIdx
+            const lang = opts[nextIdx].value
+            // 在编辑器内更新代码块语言属性
+            editor.chain().focus().updateAttributes('codeBlock', { language: lang === 'text' ? null : lang }).run()
+        })
+
+        // 当光标在代码块内时显示语言选择器并同步当前语言，移出时隐藏
         editor.on('selectionUpdate', () => {
             if (editor.isActive('codeBlock')) {
                 langSelect.style.display = ''
                 const attrs = editor.getAttributes('codeBlock')
-                langSelect.value = attrs.language || ''
+                langSelect.value = attrs.language || 'text'
             } else {
                 langSelect.style.display = 'none'
             }
         })
-
-        // 语言切换
-        langSelect.addEventListener('change', () => {
-            const lang = langSelect.value
-            editor.chain().focus().updateAttributes('codeBlock', { language: lang || null }).run()
-            editor.commands.focus()
-        })
     }
 
     // ---- 代码块语言标签注入 ----
     // 为每个 <pre> 注入语言标签 DOM 元素（因为 CSS ::before 在 overflow:auto 容器中不可靠）
+    // Tiptap CodeBlockLowlight 在 pre 上输出 data-language 属性，同时 code 上有 language-xxx class
     function injectCodeLangLabels() {
         const editorEl = document.querySelector('#editor-container .tiptap')
         if (!editorEl) return
@@ -170,16 +177,22 @@ function setupToolbar() {
             const old = pre.querySelector('.code-lang-label')
             if (old) old.remove()
 
-            const lang = pre.getAttribute('data-language')
+            // 从 pre 的 data-language 或 code 的 class 中获取语言
-            if (lang) {
+            let lang = pre.getAttribute('data-language')
+            if (!lang) {
+                const code = pre.querySelector('code')
+                if (code) {
+                    const match = code.className.match(/language-(\w+)/)
+                    if (match) lang = match[1]
+                }
+            }
+            lang = lang || 'text'
+
             const label = document.createElement('div')
             label.className = 'code-lang-label'
             label.textContent = lang
             pre.insertBefore(label, pre.firstChild)
             pre.style.paddingTop = '32px'
-            } else {
-                pre.style.paddingTop = ''
-            }
         })
     }