JQuery AutoComplete结果格式？

[
  "apple",
  "banana",
  "orange"
]

[
  {
    "label": "apple",
    "value": "1"
  },
  {
    "label": "banana",
    "value": "2"
  },
  {
    "label": "orange",
    "value": "3"
  }
]

$( "#autocomplete" ).autocomplete({
  source: function( request, response ) {
    $.getJSON( "search.php", {
      term: request.term
    }, response );
  },
  focus: function( event, ui ) {
    $( "#autocomplete" ).val( ui.item.label );
    return false;
  },
  select: function( event, ui ) {
    $( "#autocomplete" ).val( ui.item.label );
    $( "#autocomplete-id" ).val( ui.item.value );
    return false;
  }
})
.autocomplete( "instance" )._renderItem = function( ul, item ) {
  return $( "<li>" )
    .append( "<div>" + item.label + "<br>" + item.desc + "</div>" )
    .appendTo( ul );
};