How to make checkbox checked according to a value in Jquery

I need to make checked status of my checkbox according to a data value. Up to now I am using below method.

$(document).ready(function(){  
      $('#add').click(function(){  
           $('#insert').val("Insert");  
           $('#update_form')[0].reset();  
      });  
      $(document).on('click', '.update_data', function(){ 
           var row_id = $(this).attr("id");  
           
           $.ajax({  
                url:"./project/userdetail.php",  
                method:"POST",  
                data:{row_id:row_id},  
                dataType:"json", 
                success:function(data){  
                      ...........
                     if(data.accesslocations=='ABC,DEF,GHI'){
                      document.getElementById("check1").checked = true;
                      document.getElementById("check2").checked = true;
                      document.getElementById("check3").checked = true;
                      
                     }

                     if(data.accesslocations=='ABC,GHI'){
                      document.getElementById("check1").checked = true;
                      document.getElementById("check3").checked = true;
                      
                     }
                     if(data.accesslocations=='ABC'){
                      document.getElementById("check1").checked = true;
                     }

                    
                     
                     
                     ...........

                 $('#employee_id_update').val(data.row_id);  
                 $('#insert').val("Update");
                 $('#new_data_Modal').modal('show'); 
                        
                      
                }, 
                error: function(req, status, error) {
               alert(req.responseText);      
                }   
           });  
      });  

My intention is to check the data.accesslocations and check whether it contains ABC or ABC,DEF likewise,

If ABC contains need to check1 status as checked.
If DEF contains need to check2 status as checked.
If GHI contains need to check3 status as checked.

I have tried below method as well. But then I could not open my dialogbox, new_data_Modal.

               if(strstr(data.accesslocations, "ABC")){
                  document.getElementById("check1").checked = true;
                 }