From 2bd7ab27bc2f1ab5f2e89e070c8c2c56a7c31a64 Mon Sep 17 00:00:00 2001
From: faiz-lab <qyp555@gmail.com>
Date: Wed, 12 May 2021 13:40:20 +0800
Subject: [PATCH] =?UTF-8?q?=E6=B7=BB=E5=8A=A00101.=E5=AF=B9=E7=A7=B0?=
 =?UTF-8?q?=E4=BA=8C=E5=8F=89=E6=A0=91=20JavaScript=E7=89=88=E6=9C=AC?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 problems/0101.对称二叉树.md | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/problems/0101.对称二叉树.md b/problems/0101.对称二叉树.md
index 85daa229..561d0470 100644
--- a/problems/0101.对称二叉树.md
+++ b/problems/0101.对称二叉树.md
@@ -263,6 +263,21 @@ Python：
 Go：
 
 
+JavaScript
+```javascript
+var isSymmetric = function(root) {
+    return check(root, root)
+};
+
+const check = (leftPtr, rightPtr) => {
+    // 如果只有根节点，返回true
+    if (!leftPtr && !rightPtr) return true
+    // 如果左右节点只存在一个，则返回false
+    if (!leftPtr || !rightPtr) return false
+    
+    return leftPtr.val === rightPtr.val && check(leftPtr.left, rightPtr.right) && check(leftPtr.right, rightPtr.left)
+}
+```
 
 
 -----------------------