From 1647bf1abee819336c8ad7afa2046a33d517f96e Mon Sep 17 00:00:00 2001
From: bob <bob_jiang@yeah.net>
Date: Fri, 24 Feb 2017 11:24:02 +0800
Subject: [PATCH] Safari can not delete dataset attribute in strict mode

---
 js/zepto-adapter.js | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/js/zepto-adapter.js b/js/zepto-adapter.js
index 80e5bce1..98bd8980 100644
--- a/js/zepto-adapter.js
+++ b/js/zepto-adapter.js
@@ -136,7 +136,7 @@
             for (var i = 0; i < this.length; i++) {
                 var el = this[i];
                 // delete multiple data in dataset
-                if (key in tmpData) delete el.dataset[key];
+                if (key in tmpData && 'undefined' !== typeof el.dataset[key]) delete el.dataset[key];
 
                 if (!el.__eleData) el.__eleData = {};
                 el.__eleData[key] = value;