From 640a405b7f179a1428b40459476a603b5a1d3b50 Mon Sep 17 00:00:00 2001
From: Horizon <719064708@qq.com>
Date: Thu, 18 Apr 2019 22:15:00 +0800
Subject: [PATCH] Update schedule.js

fix a potential problem in schedule.js
---
 src/schedule.js | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/schedule.js b/src/schedule.js
index 0aace9c21..94266b6bb 100644
--- a/src/schedule.js
+++ b/src/schedule.js
@@ -29,6 +29,7 @@ if (util.isNode && typeof MutationObserver === "undefined") {
 // do not fire DOM mutation events for some reason on iOS 8.3+ and cordova
 // apps which have the same bug but are not `.navigator.standalone`
 } else if ((typeof MutationObserver !== "undefined") &&
+          ("classList" in document.documentElement)
           !(typeof window !== "undefined" &&
             window.navigator &&
             (window.navigator.standalone || window.cordova))) {