diff --git a/demo.html b/demo.html
index f8abd1e..eb52493 100644
--- a/demo.html
+++ b/demo.html
@@ -70,17 +70,22 @@
         div.innerHTML = str
         document.body.appendChild(div)
       }
+      // anki中 不可以使用let/const
       var JQ_CDN =
         'https://cdnjs.cloudflare.com/ajax/libs/jquery/3.6.0/jquery.min.js'
       var SHOWDOWN_CDN =
-        'https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js'
+        // 'https://cdnjs.cloudflare.com/ajax/libs/showdown/1.9.1/showdown.min.js'
+        'https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/showdown/2.0.0/showdown.min.js'
       var HIGHLIGHT_JS_CDN =
-        'https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/highlight.min.js'
+        // 'https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/highlight.min.js'
+        'https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/highlight.js/11.4.0/highlight.min.js'
       var HIGHLIGHT_CSS_CDN =
         // 'https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/styles/default.min.css'
-        'https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/styles/base16/onedark.min.css'
+        // 'https://cdnjs.cloudflare.com/ajax/libs/highlight.js/11.3.1/styles/base16/onedark.min.css'
+        'https://lf26-cdn-tos.bytecdntp.com/cdn/expire-1-M/highlight.js/11.4.0/styles/base16/onedark.min.css'
       var GITHUB_MARKDOWN_CSS_CDN =
-        'https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/5.0.0/github-markdown.min.css'
+        // 'https://cdnjs.cloudflare.com/ajax/libs/github-markdown-css/5.0.0/github-markdown.min.css'
+        'https://lf9-cdn-tos.bytecdntp.com/cdn/expire-1-M/github-markdown-css/5.1.0/github-markdown-dark.min.css'
       // 加载库文件
       var createScript = (src) => {
         var scriptElement = document.createElement('script')