From c04151cde4f6c0129a4c35dd788be655a888d68e Mon Sep 17 00:00:00 2001
From: Hencky2018 <Hencky@github.com>
Date: Thu, 22 Nov 2018 11:30:44 +0800
Subject: [PATCH] add let

---
 docs/set-map.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/docs/set-map.md b/docs/set-map.md
index d223fca..58a3a7c 100644
--- a/docs/set-map.md
+++ b/docs/set-map.md
@@ -219,7 +219,7 @@ for (let x of set) {
 Set 结构的实例与数组一样，也拥有`forEach`方法，用于对每个成员执行某种操作，没有返回值。
 
 ```javascript
-set = new Set([1, 4, 9]);
+let set = new Set([1, 4, 9]);
 set.forEach((value, key) => console.log(key + ' : ' + value))
 // 1 : 1
 // 4 : 4