Create global function file

src/_data/global.js

@@ -0,0 +1,8 @@
+module.exports = {
+    random() {
+      const segment = () => {
+        return (((1 + Math.random()) * 0x10000) | 0).toString(16).substring(1);
+      };
+      return `${segment()}-${segment()}-${segment()}`;
+    }
+};