使用$ .map函数进行jQuery UI自动完成缓存

$( "#tags" ).autocomplete({
  source: function( request, response ) {
    $.ajax({
      url: "search.php",
      dataType: "json",
      data: {
        term: request.term
      },
      success: function( data ) {
        response( $.map( data, function( item ) {
          return {
            label: item.label,
            value: item.value
          }
        }));
      }
    });
  },
  minLength: 2
});