var items = document.createElement("ul");
items.setAttribute("id","items");
document.body.appendChild(items);

for(var i=0;i<5;i++){
  var newil=document.createElement("li");
  var newiltext=document.createTextNode("A new il "+i);
  newil.appendChild(newiltext);
  var items2 = document.getElementById('items');
  items2.appendChild(newil);
}