扩展模式参考网址：

http://blog.csdn.net/shanliangliuxing/article/details/8112890

http://www.cnblogs.com/haogj/archive/2011/06/18/2084384.html

我的实际应用案例：

$("#user").autocomplete({

            source: function(request, response) {

                $.ajax({

                    url: "<!--{$basePath}-->decision_mobile/login/user_search/code/" + request.term+"/",

                    dataType: "json",

                    success: function(data) {

                        response($.map(data, function(item) {

                            return {

                                label: item.name_login  + "【" +item.role+"】",

                                value: item.name_login,

                                id:item.id

                            }

                        }));

                    }

                });

            },

            minLength: 2,

            select: function(e, ui)

            {

                $("#user_id").val(ui.item.id);

                $("#user_pwd").attr("disabled",false);

                $("#user_pwd").focus();

            }

        });