public function productAdd(Request $request)
 {
     $name = $request->input('name', '');
     $summary = $request->input('summary', '');
     $price = $request->input('price', '');
     $category_id = $request->input('category_id', '');
     $preview = $request->input('preview', '');
     $content = $request->input('content', '');
     $preview1 = $request->input('preview1', '');
     $preview2 = $request->input('preview2', '');
     $preview3 = $request->input('preview3', '');
     $preview4 = $request->input('preview4', '');
     $preview5 = $request->input('preview5', '');
     $product = new Product();
     $product->summary = $summary;
     $product->price = $price;
     $product->category_id = $category_id;
     $product->preview = $preview;
     $product->name = $name;
     $product->save();
     $pdt_content = new PdtContent();
     $pdt_content->product_id = $product->id;
     $pdt_content->content = $content;
     $pdt_content->save();
     if ($preview1 != '') {
         $pdt_images = new PdtImages();
         $pdt_images->image_path = $preview1;
         $pdt_images->image_no = 1;
         $pdt_images->product_id = $product->id;
         $pdt_images->save();
     }
     if ($preview2 != '') {
         $pdt_images = new PdtImages();
         $pdt_images->image_path = $preview2;
         $pdt_images->image_no = 2;
         $pdt_images->product_id = $product->id;
         $pdt_images->save();
     }
     if ($preview3 != '') {
         $pdt_images = new PdtImages();
         $pdt_images->image_path = $preview3;
         $pdt_images->image_no = 3;
         $pdt_images->product_id = $product->id;
         $pdt_images->save();
     }
     if ($preview4 != '') {
         $pdt_images = new PdtImages();
         $pdt_images->image_path = $preview4;
         $pdt_images->image_no = 4;
         $pdt_images->product_id = $product->id;
         $pdt_images->save();
     }
     if ($preview5 != '') {
         $pdt_images = new PdtImages();
         $pdt_images->image_path = $preview5;
         $pdt_images->image_no = 5;
         $pdt_images->product_id = $product->id;
         $pdt_images->save();
     }
     $m3_result = new M3Result();
     $m3_result->status = 0;
     $m3_result->message = '添加成功';
     return $m3_result->toJson();
 }