diff --git a/themes/hugo-theme-wave/layouts/partials/head.html b/themes/hugo-theme-wave/layouts/partials/head.html
index d0e90b0..35d84ba 100644
--- a/themes/hugo-theme-wave/layouts/partials/head.html
+++ b/themes/hugo-theme-wave/layouts/partials/head.html
@@ -24,6 +24,7 @@
         inlineMath: [['$','$'], ['\\(','\\)']]}
       });
     </script>
+    <script src="{{ .Site.BaseURL }}js/main.js"></script>
 
     <link rel="icon" href="{{ .Site.BaseURL }}favicon.ico" />
     <link rel="apple-touch-icon" href="{{ .Site.BaseURL }}apple-touch-icon.png" />
diff --git a/themes/hugo-theme-wave/static/js/main.js b/themes/hugo-theme-wave/static/js/main.js
new file mode 100644
index 0000000..562140d
--- /dev/null
+++ b/themes/hugo-theme-wave/static/js/main.js
@@ -0,0 +1,18 @@
+// dip service
+
+function main() {
+  var jqxhr =
+    $.ajax({
+      url: "https://ip.paulbsd.com",
+      headers: {
+        'Access-Control-Allow-Origin': '*',
+        'Accept': 'application/json',
+      },
+      dataType: 'json',
+    }).done(function(){ console.log(data.ip) });
+    return jqxhr;
+}
+
+$(document).ready(function() {
+  main();
+});