Initial commit

Co-Authored-By: Claude Opus 5.5 (1M context) <noreply@anthropic.com>
2026-09-23 14:43:16 +07:00
commit bef9f8b4ed
663 changed files with 81305 additions and 0 deletions
@@ -0,0 +1,30 @@
+(function () {
+  var scrollToTopButton = document.getElementById("scrollToTopButton");
+  if (!scrollToTopButton) return;
+
+  var ticking = false;
+  var lastVisible = null;
+
+  function updateVisibility() {
+    ticking = false;
+    // 用 visualViewport / 近似阈值，避免反复读 layout 几何属性触发强制重排
+    var threshold = Math.max(window.innerHeight || 600, 600);
+    var shouldShow = (window.scrollY || window.pageYOffset || 0) > threshold;
+    if (shouldShow === lastVisible) return;
+    lastVisible = shouldShow;
+    scrollToTopButton.classList.toggle("is-visible", shouldShow);
+  }
+
+  function onScroll() {
+    if (ticking) return;
+    ticking = true;
+    window.requestAnimationFrame(updateVisibility);
+  }
+
+  scrollToTopButton.addEventListener("click", function () {
+    window.scrollTo({ top: 0, behavior: "smooth" });
+  });
+
+  window.addEventListener("scroll", onScroll, { passive: true });
+  window.requestAnimationFrame(updateVisibility);
+})();