perf: load giscus and comment count lazily

3 files changed, 53 insertions, 31 deletions

diff --git a/layouts/_partials/posts/action-menu.html b/layouts/_partials/posts/action-menu.html
index b5c75279..5f79ad98 100644
--- a/layouts/_partials/posts/action-menu.html
+++ b/layouts/_partials/posts/action-menu.html
@@ -1,4 +1,4 @@
-<div class="my-8 mb-4">
+<div id="action-menu" class="my-8 mb-4">
   <!-- 操作按钮组 -->
   <div class="flex justify-between items-center mb-6">
     <div class="flex gap-2">
diff --git a/layouts/_partials/posts/comment.html b/layouts/_partials/posts/comment.html
index 01e04cb4..af0def7e 100644
--- a/layouts/_partials/posts/comment.html
+++ b/layouts/_partials/posts/comment.html
@@ -32,19 +32,35 @@
     </div>
 
     <!-- giscus script -->
-    <script id="giscus-script"
-            src="https://giscus.app/client.js"
-            data-repo="{{ .Site.Params.giscus.repo }}"
-            data-repo-id="{{ .Site.Params.giscus.repoId }}"
-            data-category="{{ .Site.Params.giscus.category }}"
-            data-category-id="{{ .Site.Params.giscus.categoryId }}"
-            data-mapping="{{ .Site.Params.giscus.mapping }}"
-            data-strict="{{ .Site.Params.giscus.strict }}"
-            data-reactions-enabled="{{ .Site.Params.giscus.reactionsEnabled }}"
-            data-emit-metadata="1"
-            data-input-position="{{ .Site.Params.giscus.inputPosition }}"
-            data-theme="{{ .Site.Params.giscus.theme }}"
-            data-lang="{{ T "lang" }}"
-            crossorigin="anonymous">
+    <script>
+    function loadGiscus() {
+      if (document.querySelector('iframe.giscus-frame')) return; // 防止重复加载
+
+      const script = document.createElement("script");
+      script.src = "https://giscus.app/client.js";
+      script.setAttribute("data-repo", "{{ .Site.Params.giscus.repo }}");
+      script.setAttribute("data-repo-id", "{{ .Site.Params.giscus.repoId }}");
+      script.setAttribute("data-category", "{{ .Site.Params.giscus.category }}");
+      script.setAttribute("data-category-id", "{{ .Site.Params.giscus.categoryId }}");
+      script.setAttribute("data-mapping", "{{ .Site.Params.giscus.mapping }}");
+      script.setAttribute("data-strict", "{{ .Site.Params.giscus.strict }}");
+      script.setAttribute("data-reactions-enabled", "{{ .Site.Params.giscus.reactionsEnabled }}");
+      script.setAttribute("data-emit-metadata", "1");
+      script.setAttribute("data-input-position", "{{ .Site.Params.giscus.inputPosition }}");
+      script.setAttribute("data-theme", "{{ .Site.Params.giscus.theme }}");
+      script.setAttribute("data-lang", "{{ T "lang" }}");
+      script.setAttribute("crossorigin", "anonymous");
+      script.async = true;
+      document.body.appendChild(script);
+    }
+
+    const observer = new IntersectionObserver((entries, obs) => {
+      if (entries[0].isIntersecting) {
+        loadGiscus();
+        obs.disconnect();
+      }
+    });
+
+    observer.observe(document.getElementById("action-menu"));
     </script>
 </div>
diff --git a/layouts/_partials/scripts/action-menu-js.html b/layouts/_partials/scripts/action-menu-js.html
index 66673b71..69f5189c 100644
--- a/layouts/_partials/scripts/action-menu-js.html
+++ b/layouts/_partials/scripts/action-menu-js.html
@@ -31,25 +31,31 @@ function initializeComments() {
 // 评论数量功能初始化
 function initializeCommentCount() {
   const commentCountEl = document.getElementById('comment-count');
-  const giscusIframe = document.querySelector('iframe.giscus-frame');
-  if (!commentCountEl || !giscusIframe) return;
-
-  commentCountEl.textContent = '0';
-
-  giscusIframe.addEventListener('load', () => {
-    window.addEventListener('message', function(event) {
-      if (event.origin !== 'https://giscus.app') return;
-
-      const giscusData = event.data;
-      if (giscusData.giscus?.discussion) {
-        const discussion = giscusData.giscus.discussion;
-        const totalComments = (discussion.totalCommentCount || 0) + (discussion.totalReplyCount || 0);
-        commentCountEl.textContent = totalComments.toString();
-      }
-    });
+  if (!commentCountEl) return;
+
+  const observer = new MutationObserver(() => {
+    const giscusIframe = document.querySelector('iframe.giscus-frame');
+    if (giscusIframe) {
+      giscusIframe.addEventListener('load', () => {
+        window.addEventListener('message', function(event) {
+          if (event.origin !== 'https://giscus.app') return;
+          const giscusData = event.data;
+          if (giscusData.giscus?.discussion) {
+            const discussion = giscusData.giscus.discussion;
+            const totalComments = (discussion.totalCommentCount || 0) + (discussion.totalReplyCount || 0);
+            commentCountEl.textContent = totalComments.toString();
+          }
+        });
+      });
+      observer.disconnect();
+    }
   });
+
+  observer.observe(document.body, { childList: true, subtree: true });
 }
 
+document.addEventListener('DOMContentLoaded', initializeCommentCount);
+
 // 点赞功能初始化
 function initializeLikes(pageId) {
   const elements = {