fix

@@ -301,7 +301,7 @@ const yoho = {
      */
     updateNavigationBar(args, success, fail) {
         if (this.isApp) {
-            window.yohoInterface.triggerEvent(success || function() {}, fail || function() {}, {
+            window.yohoInterface.triggerEvent(success || nullFun, fail || nullFun, {
                 method: 'update.navigationBarStyle',
                 arguments: args
             });