feat: 添加 GA 分析代码

Author: Zhicheng WANG

src/index.html

@@ -16,5 +16,18 @@
 <script src="/assets/js/translator.js" async></script>
 <link rel="stylesheet" href="https://unpkg.com/gitalk/dist/gitalk.css">
 <script src="https://unpkg.com/gitalk/dist/gitalk.min.js"></script>
+<!-- Global site tag (gtag.js) - Google Analytics -->
+<script async src="https://www.googletagmanager.com/gtag/js?id=UA-159351998-1"></script>
+<script>
+  window.dataLayer = window.dataLayer || [];
+
+  function gtag() {
+    dataLayer.push(arguments);
+  }
+
+  gtag('js', new Date());
+
+  gtag('config', 'UA-159351998-1');
+</script>
 </body>
 </html>