From bd8bbfff2a076b888a3c46d560bcbe80cb373dc2 Mon Sep 17 00:00:00 2001
From: lpyt <lpyt2013@163.com>
Date: Thu, 29 Sep 2016 12:57:41 +0800
Subject: [PATCH] fixed ie8 not support

---
 src/gridstack.js | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/gridstack.js b/src/gridstack.js
index 3b5a660..2978901 100644
--- a/src/gridstack.js
+++ b/src/gridstack.js
@@ -61,7 +61,7 @@
                 style.appendChild(document.createTextNode(''));
             }
             document.getElementsByTagName('head')[0].appendChild(style);
-            return style.sheet;
+            return style.sheet || style.styleSheet;
         },
 
         removeStylesheet: function(id) {
@@ -71,7 +71,7 @@
         insertCSSRule: function(sheet, selector, rules, index) {
             if (typeof sheet.insertRule === 'function') {
                 sheet.insertRule(selector + '{' + rules + '}', index);
-            } else if (typeof sheet.addRule === 'function') {
+            } else if (sheet.addRule) {
                 sheet.addRule(selector, rules, index);
             }
         },