public function issue(Request $request)
 {
     $input = $request->only('pro_name', 'parent_cate', 'son_cate', 'contact', 'pro_desc', 'desire', 'activity');
     $input['username'] = $request->session()->get('username');
     $validator = Validator::make($request->all(), ['pro_name' => 'required|max:255', 'parent_cate' => 'required|max:30', 'son_cate' => 'required|max:255', 'contact' => 'required', 'pro_desc' => 'required', 'desire' => 'required']);
     if ($validator->fails()) {
         return $this->fail('输入信息不符合要求');
     }
     return Goods::issue($input);
 }