From 93b39144063ff3820cb8c2cec8c95c8ce9058039 Mon Sep 17 00:00:00 2001
From: Sukoshi <guanquanhong@163.com>
Date: Tue, 15 Mar 2022 15:06:18 +0800
Subject: [PATCH] =?UTF-8?q?fix(javascript=5F09):=20=E4=BF=AE=E5=A4=8D?=
 =?UTF-8?q?=E5=87=BA=E9=98=9F=E6=9C=80=E5=90=8E=E4=B8=80=E4=B8=AA=E5=85=83?=
 =?UTF-8?q?=E7=B4=A0=E4=BB=A5=E5=90=8E=E6=9C=AA=E6=B8=85=E7=A9=BA=E5=B0=BE?=
 =?UTF-8?q?=E9=83=A8=E6=95=B0=E6=8D=AE=E7=9A=84bug?=
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

---
 javascript/09_queue/QueueBasedOnLinkedList.js | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/javascript/09_queue/QueueBasedOnLinkedList.js b/javascript/09_queue/QueueBasedOnLinkedList.js
index 75918585..a1cbe4e7 100644
--- a/javascript/09_queue/QueueBasedOnLinkedList.js
+++ b/javascript/09_queue/QueueBasedOnLinkedList.js
@@ -31,6 +31,9 @@ class QueueBasedOnLinkedList {
         if (this.head !== null) {
             const value = this.head.element
             this.head = this.head.next
+            if (this.head === null) {
+                this.tail = null
+            }
             return value
         } else {
             return -1