get json_encode from codeigniter controller to jquery

I think your controller doesnt produce the valid json. since it would produce a json string like this one :

{scoreCH:<SomeValue>}{ScoreCH:<SomeValue>}{ScoreCH:<Somevalue>}

It would be better if you put the set of ScoreCH value inside some "json wrapper" so you should modify you controller to create a temporary variable that contain all your values from the model like this one :

public function countScoreCh(){
    $id = $this->session->userdata('userID');
    $data['getScore'] = $this->lawmodel->battleUserID($id);
    // Here is "my hack"
    $output = array(); // it will wrap all of your value
    foreach($data['getScore'] as $row){
          unset($temp); // Release the contained value of the variable from the last loop
          $temp = array();

          // It guess your client side will need the id to extract, and distinguish the ScoreCH data
          $temp['id_of_ScoreCH'] = $row->id;
          $temp['ScoreCH'] = $row->ScoreCH;

          array_push($output,$temp);
    }
    // Now the $output supposed to be a two dimensional array looks like this one
    // array(
    //    [0]=>array("id_of_ScoreCH"=>SomeID,"ScoreCH"=>SomeValue),
    //    [1]=>array("id_of_ScoreCH"=>SomeID,"ScoreCH"=>SomeValue),
    //    [2]=>array("id_of_ScoreCH"=>SomeID,"ScoreCH"=>SomeValue)
    //   );

    // Then emit the wrapped value It would produce array of object JSON
    // Dont forget to put the header format
    header('Access-Control-Allow-Origin: *');
    header("Content-Type: application/json");
    echo json_encode($output);
 }

Next on your client side (HTML) use the JSON.parse(<string_retrieved_from_controller>) like this one :

$.ajax({
    url:<your_controller_name/you_method_name>,
    data: <your_specific_data_you_want_to_pass_to_the_server>,
    method:<post/get>
    success:function(retrieved_data){
         // Your code here.. use something like this
         var Obj = JSON.parse(retrieved_data)

         // Since your controller produce array of object you can access the value by using this one :
         for(var a=0; a< Obj.length; a++){
              alert("the value with id : " + Obj.id_of_scoreCH + "is " + Obj.ScoreCH);
         }
    }
});