The [JQuery documentation for getJSON](http://api.jquery.com/jquery.getjson/) shows an example of:

```
var jqxhr = $.getJSON( "example.json", function() {
  console.log( "success" );
})
  .done(function() {
    console.log( "second success" );
  })
  .fail(function() {
    console.log( "error" );
  })
  .always(function() {
    console.log( "complete" );
  });

```

What's the difference between the success function (passed as the 2nd parameter) the the done() function? They seem to be the same thing.