feat: add ga4

ronething · ronething · commit 99eff0305e57 · 2025-09-21T23:14:52.000+08:00
Signed-off-by: Ashing Zheng &lt;axingfly@gmail.com&gt;
diff --git a/book/theme/index.hbs b/book/theme/index.hbs
@@ -74,6 +74,16 @@
         <!-- MathJax -->
         <script async type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/mathjax/2.7.1/MathJax.js?config=TeX-AMS-MML_HTMLorMML"></script>
         {{/if}}
+
+        <!-- Google tag (gtag.js) -->
+        <script async src="https://www.googletagmanager.com/gtag/js?id=G-YSTSJQMB6T"></script>
+        <script>
+          window.dataLayer = window.dataLayer || [];
+          function gtag(){dataLayer.push(arguments);}
+          gtag('js', new Date());
+
+          gtag('config', 'G-YSTSJQMB6T');
+        </script>
     </head>
     <body>
         <!-- Provide site root to javascript -->
