gistfile1.txt

//code
var win=0;
var mygrid;
var col;

function columns(url){    
  $.getJSON("/provincias.json", function(data) {
    col = ["id","nombre"];
  });
  alert(col);
  return ["id","name"];
    
}; 

$(function(){
  columns("/provincias.json")
});​

// problem. the col var in alert(col) always are undifened