diff --git a/backend/actions/CreateAction.php b/backend/actions/CreateAction.php
index 0093d091..ef13fda1 100644
--- a/backend/actions/CreateAction.php
+++ b/backend/actions/CreateAction.php
@@ -12,6 +12,7 @@
 use stdClass;
 use backend\actions\helpers\Helper;
 use yii\base\Exception;
+use yii\web\Response;
 use yii\web\UnprocessableEntityHttpException;
 
 /**
@@ -103,6 +104,7 @@ public function run()
             $createResult = call_user_func_array($this->doCreate, $createData);//call doCreate closure
 
             if (Yii::$app->getRequest()->getIsAjax()) { //ajax
+                Yii::$app->getResponse()->format = Response::FORMAT_JSON;
                 if ($createResult === true) {//only $createResult is true represent create success
                     return ['code' => 0, 'msg' => 'success', 'data' => new stdClass()];
                 } else {
diff --git a/backend/actions/DeleteAction.php b/backend/actions/DeleteAction.php
index 74eaff05..61b6727c 100644
--- a/backend/actions/DeleteAction.php
+++ b/backend/actions/DeleteAction.php
@@ -15,6 +15,7 @@
 use yii\base\Exception;
 use yii\web\BadRequestHttpException;
 use yii\web\MethodNotAllowedHttpException;
+use yii\web\Response;
 use yii\web\UnprocessableEntityHttpException;
 
 /**
@@ -77,12 +78,14 @@ public function run()
 
             if (count($errors) == 0) {
                 if( Yii::$app->getRequest()->getIsAjax() ) {
+                    Yii::$app->getResponse()->format = Response::FORMAT_JSON;
                     return ['code'=>0, 'msg'=>'success', 'data'=>new stdClass()];
                 }else {
                     return $this->controller->redirect(Yii::$app->getRequest()->getReferrer());
                 }
             } else {
                 if( Yii::$app->getRequest()->getIsAjax() ){
+                    Yii::$app->getResponse()->format = Response::FORMAT_JSON;
                     throw new UnprocessableEntityHttpException(implode("<br>", $errors));
                 }else {
                     Yii::$app->getSession()->setFlash('error', implode("<br>", $errors));
diff --git a/backend/actions/DoAction.php b/backend/actions/DoAction.php
index 76079b20..1e7cbc8a 100644
--- a/backend/actions/DoAction.php
+++ b/backend/actions/DoAction.php
@@ -12,6 +12,7 @@
 use stdClass;
 use backend\actions\helpers\Helper;
 use yii\base\Exception;
+use yii\web\Response;
 use yii\web\UnprocessableEntityHttpException;
 
 /**
@@ -91,6 +92,7 @@ public function run()
 
         if (Yii::$app->getRequest()->getIsAjax()) { //ajax
             if ($doResult === true) {//only $doResult is true represent create success
+                Yii::$app->getResponse()->format = Response::FORMAT_JSON;
                 return ['code' => 0, 'msg' => 'success', 'data' => new stdClass()];
             } else {//not ajax
                 throw new UnprocessableEntityHttpException(Helper::getErrorString($doResult));
diff --git a/backend/actions/SortAction.php b/backend/actions/SortAction.php
index 9c3cde0c..3b0e9092 100644
--- a/backend/actions/SortAction.php
+++ b/backend/actions/SortAction.php
@@ -15,6 +15,7 @@
 use yii\base\Exception;
 use yii\base\InvalidArgumentException;
 use yii\web\MethodNotAllowedHttpException;
+use yii\web\Response;
 use yii\web\UnprocessableEntityHttpException;
 
 /**
@@ -72,6 +73,7 @@ public function run()
             $result = call_user_func_array($this->doSort, [$condition, $value, $this]);
 
             if (Yii::$app->getRequest()->getIsAjax()) {
+                Yii::$app->getResponse()->format = Response::FORMAT_JSON;
                 if( $result === true ){
                     return ['code'=>0, 'msg'=>'success', 'data'=>new stdClass()];
                 }else{
diff --git a/backend/actions/UpdateAction.php b/backend/actions/UpdateAction.php
index 7b2604e6..4beae2f1 100644
--- a/backend/actions/UpdateAction.php
+++ b/backend/actions/UpdateAction.php
@@ -14,6 +14,7 @@
 use Closure;
 use backend\actions\helpers\Helper;
 use yii\base\Exception;
+use yii\web\Response;
 use yii\web\UnprocessableEntityHttpException;
 
 /**
@@ -108,6 +109,7 @@ public function run()
             $updateResult = call_user_func_array($this->doUpdate, $updateData);//call doUpdate closure
 
             if(  Yii::$app->getRequest()->getIsAjax() ){ //ajax
+                Yii::$app->getResponse()->format = Response::FORMAT_JSON;
                 if( $updateResult === true ){//only $updateResult is true represent update success
                     return ['code'=>0, 'msg'=>'success', 'data'=>new stdClass()];
                 }else{
diff --git a/backend/widgets/ueditor/UeditorAction.php b/backend/widgets/ueditor/UeditorAction.php
index 201b717b..68a85f7d 100755
--- a/backend/widgets/ueditor/UeditorAction.php
+++ b/backend/widgets/ueditor/UeditorAction.php
@@ -454,12 +454,16 @@ protected function manage($allowFiles, $listSize, $path)
         /* 获取文件列表 */
         $path = Yii::getAlias('@ueditor') . (substr($path, 0, 1) == '/' ? '' : '/') . $path;
         $files = $this->getFiles($path, $allowFiles);
-        if (! count($files)) {
+        $len = 0;
+        if( $files !== null ){
+            $len = count($files);
+        }
+        if ( $len == 0 ) {
             $result = [
                 'state' => 'no match file',
                 'list' => [],
                 'start' => $start,
-                'total' => count($files),
+                'total' => $len,
             ];
             return $result;
         }
@@ -473,7 +477,7 @@ protected function manage($allowFiles, $listSize, $path)
             'state' => 'SUCCESS',
             'list' => $list,
             'start' => $start,
-            'total' => count($files),
+            'total' => $len,
         ];
         return $result;
     }