4.2 added

2026-03-23 23:44:26 +09:00
parent a5b0cc7b8f
commit a869f49907
3 changed files with 59 additions and 0 deletions
--- a/w4_2_recursion_countdown/index.js
+++ b/w4_2_recursion_countdown/index.js
@@ -0,0 +1,25 @@
+function countDown(n) {
+  if (n == 0) {
+    celebrate();
+    setText('Happy New Year!');
+  } else {
+    setText(n);
+    setTimeout(() => {
+      countDown(n - 1);
+    }, 1000);
+  }
+}
+
+const n = 10;
+setText(n);
+countDown(n);
+
+// Helpers
+function setText(n) {
+  document.getElementById('countdown').textContent = n;
+}
+
+function celebrate() {
+  const jsConfetti = new JSConfetti();
+  jsConfetti.addConfetti();
+}