tab卡保持状态bug

@@ -21,12 +21,11 @@ tab.prototype = {
 
 
 		var pattern = /tab=.*?(?=&&)/gi,
-			tab = null,
+			tab = pattern.exec(location.hash),
 			index = null;
 
-
-		if (location.hash != '') {
-			tab = pattern.exec(location.hash) ? pattern.exec(location.hash)[0] : '';
+		if (tab instanceof Array) {
+			tab = tab[0];
 			index = tab.split('=')[1];
 		}
 		g.index = index;