整理静态资源结构

assets/js/main.js

@@ -0,0 +1,15 @@
+const year = document.querySelector("#year");
+const header = document.querySelector("[data-header]");
+
+if (year) {
+  year.textContent = new Date().getFullYear();
+}
+
+if (header) {
+  const updateHeader = () => {
+    header.classList.toggle("is-scrolled", window.scrollY > 8);
+  };
+
+  updateHeader();
+  window.addEventListener("scroll", updateHeader, { passive: true });
+}