Edit in JSFiddle

//Loop scope closure example for programadorobjetivo.co
function externa() {

    var list = document.getElementById("list");
    
    for (var i = 1; i <= 5; i++) {
      var item = document.createElement("button");
      item.appendChild(document.createTextNode("Click me " + i));

//--------Outra Alternativa------------
//      (function(valor) {
//        var j = valor;
//        item.onclick = function interna (event) {
//          alert("Item " + j + " is clicked.");
//        };   
//      })(i);
        
        function setClickEvent(valor){
          item.onclick = function interna (event) {
            alert("Item " + valor + " is clicked.");
          };   
        };
        
      setClickEvent(i);             
      list.appendChild(item);
    }
    
};

externa();