问如何使用jquery以laravel计算平均评分

EN

 User_id | consultant_id | rating
 ---------------------------------      
        1           1        2
 ---------------------------------
        2           1        3
 ---------------------------------
        3           1        1
 ---------------------------------
        4           1        1

public function searchConsultants(Request $request)
{
         $location = $request->get('location');
         $data = Consultant::where('location','LIKE','%'.$location.'%')->with('ratings')->get();
         return response()->json($data);
}

[{"id":1,"cunsultant_name":"Manjunath Mj",
     "contact_number":"9035206471",
     "location":"Delhi",
     "department_id":1,09:00:51",

       "ratings":[{
           "id":1,"customer_id":1,"consultant_id":1,"rating":4, 
           "id":2,"customer_id":2,"consultant_id":1,"rating":2, 
           "id":3,"customer_id":3,"consultant_id":1,"rating":1, 
           "id":4,"customer_id":4,"consultant_id":1,"rating":5, 
    }]
}]      

$.each(data, function(index) {
   str +="<tr><td>"+data[index].id+"</td>
  <td>"+data[index].cunsultant_name+"</td>
  <td>"+data[index].contact_number+"</td>
  <td>"+data[index].ratings[index].rating_for_manager+"</td><td>"+data[index].location+"</td></tr>";
});