From e7000d636808e6c65c215a7596521524e569999c Mon Sep 17 00:00:00 2001
From: Pan <panfree23@gmail.com>
Date: Wed, 12 Jun 2019 00:19:46 +0800
Subject: [PATCH] docs(async): refine sleep

---
 docs/async.md | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/docs/async.md b/docs/async.md
index 8f4cb02..3c845b8 100644
--- a/docs/async.md
+++ b/docs/async.md
@@ -253,8 +253,8 @@ class Sleep {
 这个例子还演示了如何实现休眠效果。JavaScript 一直没有休眠的语法，但是借助`await`命令就可以让程序停顿指定的时间。下面给出了一个简化的`sleep`实现。
 
 ```javascript
-async function sleep(interval) {
-  await new Promise(resolve => {
+function sleep(interval) {
+  return new Promise(resolve => {
     setTimeout(resolve, interval);
   })
 }