From 9a5d7a43aaef7cfb17ecb334c417b9321a3261e4 Mon Sep 17 00:00:00 2001
From: xiefei89 <xiefei890721@gmail.com>
Date: Thu, 20 Sep 2018 12:15:46 +0800
Subject: [PATCH] IE10 does not support Map (#325)

---
 src/utils/isMap.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/utils/isMap.js b/src/utils/isMap.js
index 53cbe1cb..9762f9c3 100644
--- a/src/utils/isMap.js
+++ b/src/utils/isMap.js
@@ -1 +1 @@
-export default value => value instanceof Map;
+export default value => typeof Map !== 'undefined' && value instanceof Map;