diff --git a/solution/2600-2699/2621.Sleep/README.md b/solution/2600-2699/2621.Sleep/README.md
index 2607dfdc0a1d6..b718f2a944108 100644
--- a/solution/2600-2699/2621.Sleep/README.md
+++ b/solution/2600-2699/2621.Sleep/README.md
@@ -70,6 +70,23 @@ async function sleep(millis: number): Promise<void> {
  */
 ```
 
+#### JavaScript
+
+```js
+/**
+ * @param {number} millis
+ * @return {Promise}
+ */
+async function sleep(millis) {
+    return new Promise(r => setTimeout(r, millis));
+}
+
+/**
+ * let t = Date.now()
+ * sleep(100).then(() => console.log(Date.now() - t)) // 100
+ */
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/2600-2699/2621.Sleep/README_EN.md b/solution/2600-2699/2621.Sleep/README_EN.md
index 4d33630e3513d..5f32460b81662 100644
--- a/solution/2600-2699/2621.Sleep/README_EN.md
+++ b/solution/2600-2699/2621.Sleep/README_EN.md
@@ -67,6 +67,23 @@ async function sleep(millis: number): Promise<void> {
  */
 ```
 
+#### JavaScript
+
+```js
+/**
+ * @param {number} millis
+ * @return {Promise}
+ */
+async function sleep(millis) {
+    return new Promise(r => setTimeout(r, millis));
+}
+
+/**
+ * let t = Date.now()
+ * sleep(100).then(() => console.log(Date.now() - t)) // 100
+ */
+```
+
 <!-- tabs:end -->
 
 <!-- solution:end -->
diff --git a/solution/2600-2699/2621.Sleep/Solution.js b/solution/2600-2699/2621.Sleep/Solution.js
new file mode 100644
index 0000000000000..91bd9ae81b5a8
--- /dev/null
+++ b/solution/2600-2699/2621.Sleep/Solution.js
@@ -0,0 +1,12 @@
+/**
+ * @param {number} millis
+ * @return {Promise}
+ */
+async function sleep(millis) {
+    return new Promise(r => setTimeout(r, millis));
+}
+
+/**
+ * let t = Date.now()
+ * sleep(100).then(() => console.log(Date.now() - t)) // 100
+ */