feat: 添加了新的javascript代码段

Author: eveningwater

Diff for: README.md

@@ -584,3 +584,4 @@
 - [随机打乱数组--2023-04-11](codes/javascript/shuffle.md)
 - [求数组交集--2023-04-12](codes/javascript/similarity.md)
 - [求大小--2023-04-13](codes/javascript/size.md)
+- [延迟异步函数--2023-04-14](codes/javascript/sleep.md)

Diff for: codes/javascript/sleep.md

@@ -0,0 +1,23 @@
+| 标题                | 标签                         |
+| ------------------- | ---------------------------- |
+| sleep(延迟异步函数) | function,promise(函数，期约) |
+
+延迟异步函数的执行。
+
+- 延迟执行异步函数的一部分，将其置于休眠状态，返回一个 Promise。
+
+```js
+const sleep = ms => new Promise(resolve => setTimeout(resolve, ms));
+```
+
+> 调用方式:
+
+```js
+async function sleepyWork() {
+  console.log("I'm going to sleep for 1 second.");
+  await sleep(1000);
+  console.log('I woke up after 1 second.');
+}
+```
+
+> 应用场景

Diff for: pages/sidebar.md

@@ -575,3 +575,4 @@
 - [随机打乱数组--2023-04-11](codes/javascript/shuffle.md)
 - [求数组交集--2023-04-12](codes/javascript/similarity.md)
 - [求大小--2023-04-13](codes/javascript/size.md)
+- [延迟异步函数--2023-04-14](codes/javascript/sleep.md)