完成显示水印功能；

app/model/Nav.php

@@ -5,36 +5,45 @@ declare(strict_types=1);
 namespace app\model;
 
 use app\common\model\Base;
-
+use app\common\tools\Image;
 
 /**
  * @mixin think\Model
  */
 class Nav extends Base
 {
-
     public static $autoClearCache = [
         [
             'type' => 'key',
             'name' => 'type_list',
-            'field' => 'type'
+            'field' => 'type',
         ],
         [
             'type' => 'tag',
-            'name' => 'page_cache'
+            'name' => 'page_cache',
         ],
     ];
 
     public static $statusName = [
         0 => '不显示',
-        1 => '显示'
+        1 => '显示',
     ];
+
     //
     public function getImgAttr($value)
     {
         return get_source_link($value);
     }
 
+    public function getImgShowAttr()
+    {
+        $src = $this->getData('img');
+
+        $watermarked_file_save_name = Image::handelWatermarkSave($src);
+
+        return $watermarked_file_save_name;
+    }
+
     public function getStatusNameAttr()
     {
         return self::$statusName[$this->getData('status')];