diff --git a/README.md b/README.md
index 4b3b067..433e83e 100644
--- a/README.md
+++ b/README.md
@@ -209,13 +209,13 @@ Doocs 技术社区，致力于打造一个内容完整、持续成长的互联
   <tr>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/doocs">
-        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
+        <img src="./images/qrcode-for-doocs.jpg" style="width: 400px;"><br>
         <sub>公众平台</sub>
       </a><br>
     </td>
     <td align="center" style="width: 200px;">
       <a href="https://github.com/yanglbme">
-        <img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
+        <img src="./images/qrcode-for-yanglbme.jpg" style="width: 400px;"><br>
         <sub>个人微信</sub>
       </a><br>
     </td>
@@ -224,4 +224,4 @@ Doocs 技术社区，致力于打造一个内容完整、持续成长的互联
 
 关注「**Doocs 开源社区**」公众号，回复 **PDF**，即可获取本项目离线 PDF 文档（283 页精华），学习更加方便！
 
-<img src="https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/pdf.png" style="width: 600px;"><br>
+<img src="./images/pdf.png" style="width: 600px;"><br>
diff --git a/docs/extra-page/cover.md b/docs/extra-page/cover.md
index e579005..0ded759 100644
--- a/docs/extra-page/cover.md
+++ b/docs/extra-page/cover.md
@@ -1,4 +1,4 @@
-[![logo](https://cdn.jsdelivr.net/gh/doocs/advanced-java@main/images/icon.png)](https://github.com/doocs/advanced-java)
+[![logo](./images/icon.png)](https://github.com/doocs/advanced-java)
 
 # 互联网 Java 工程师进阶知识完全扫盲
 
diff --git a/index.html b/index.html
index 07b0418..43779c1 100644
--- a/index.html
+++ b/index.html
@@ -9,8 +9,8 @@
   <meta name="description" content="互联网 Java 工程师进阶知识完全扫盲，项目维护者：杨立滨" />
   <meta name="viewport"
     content="width=device-width, user-scalable=no, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0" />
-  <link rel="stylesheet" href="//cdn.jsdelivr.net/npm/docsify/lib/themes/vue.css" />
-  <link rel="stylesheet" href="//cdn.jsdelivr.net/npm/docsify-darklight-theme@latest/dist/style.min.css">
+  <link rel="stylesheet" href="//unpkg.com/docsify/lib/themes/vue.css" />
+  <link rel="stylesheet" href="//unpkg.com/docsify-darklight-theme@latest/dist/style.min.css">
   <link rel="icon" type="image/png" sizes="32x32" href="images/favicon-32x32.png" />
   <link rel="icon" type="image/png" sizes="16x16" href="images/favicon-16x16.png" />
   <style>
@@ -161,14 +161,15 @@
       ],
     };
   </script>
-  <script src="//cdn.jsdelivr.net/npm/docsify/lib/docsify.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/prismjs/components/prism-java.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/docsify-copy-code@2.1.1/dist/docsify-copy-code.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/docsify/lib/plugins/search.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/docsify/lib/plugins/emoji.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/docsify/lib/plugins/zoom-image.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/docsify-pagination/dist/docsify-pagination.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/docsify-darklight-theme@latest/dist/index.min.js"></script>
-  <script src="//cdn.jsdelivr.net/npm/docsify-contributors@latest/dist/index.min.js"></script>
+  <script src="//unpkg.com/docsify/lib/docsify.min.js"></script>
+  <script src="//unpkg.com/prismjs/components/prism-java.min.js"></script>
+  <script src="//unpkg.com/docsify-copy-code@2.1.1/dist/docsify-copy-code.min.js"></script>
+  <script src="//unpkg.com/docsify/lib/plugins/search.min.js"></script>
+  <script src="//unpkg.com/docsify/lib/plugins/emoji.min.js"></script>
+  <script src="//unpkg.com/docsify/lib/plugins/zoom-image.min.js"></script>
+  <script src="//unpkg.com/docsify-pagination/dist/docsify-pagination.min.js"></script>
+  <script src="//unpkg.com/docsify-darklight-theme@latest/dist/index.min.js"></script>
+  <script src="//unpkg.com/docsify-contributors@latest/dist/index.min.js"></script>
 </body>
+
 </html>
\ No newline at end of file