关于JQuery.pager分页的有关问题，请各个大侠帮忙看看

<script type="text/javascript">
        var count = "";
        //统计总记录
        function RecordCount() {
            $.ajax({
                dataType: "json",
                url: "WebService.asmx/XmltoJson",
                contentType: "application/json;",
                type: "POST",
                success: function (xml) {
                    var json = eval('(' + xml.d + ')');
                    $("#txtCount").val($(json.jinshu.item).length);
                }
            });
        }
        //输出数据
        function InitData(pageclickednumber) {
            $.ajax({
                dataType: 'json',
                url: "WebService.asmx/XmltoJson",
                contentType: "application/json;",
                //data: { pageindex: pageclickednumber },
                type: "POST",
                success: function (xml) {
                    var tbody = "";
                    var json = eval('(' + xml.d + ')');
                    $("#txtCount").val($(json.jinshu.item).length);
                    $.each(json.jinshu.item, function (i, n) {
                        var str = "";
                        str += "<tr><td>" + n["@newsid"] + "</td><td>" + n["@newstitle"] + "</td><td>" + n["@url"] + "</td><td>" + n["@auditortime"] + "</td><td>" + n["@newssort"] + "</td></tr>";
                        tbody += str;
                    });
                    $("#TBODY").append(tbody);
                }
            });            
        }
        //初始化
        $(document).ready(function () {
            RecordCount();
            $("#pager").pager({ pagenumber: 1, pagecount: $("#txtCount").val(), buttonClickCallback: PageClick });
            PageClick(1);
        });
        //回调分页
        PageClick = function (pageclickednumber) {
            $("#pager").pager({ pagenumber: pageclickednumber, pagecount: $("#txtCount").val(), buttonClickCallback: PageClick });
            InitData(pageclickednumber);
        }
    </script>

(function($) {

    $.fn.pager = function(options) {

        var opts = $.extend({}, $.fn.pager.defaults, options);

        return this.each(function() {

        // empty out the destination element and then render out the pager with the supplied options
            $(this).empty().append(renderpager(parseInt(options.pagenumber), parseInt(options.pagecount), options.buttonClickCallback));
            
            // specify correct cursor activity
            $('.pages li').mouseover(function() { document.body.style.cursor = "pointer"; }).mouseout(function() { document.body.style.cursor = "auto"; });
        });
    };

    // render and return the pager with the supplied options
    function renderpager(pagenumber, pagecount, buttonClickCallback) {

        // setup $pager to hold render
        var $pager = $('<ul class="pages"></ul>');

        // add in the previous and next buttons
        $pager.append(renderButton('first', pagenumber, pagecount, buttonClickCallback)).append(renderButton('prev', pagenumber, pagecount, buttonClickCallback));

        // pager currently only handles 10 viewable pages ( could be easily parameterized, maybe in next version ) so handle edge cases
        var startPoint = 1;
        var endPoint = 9;

        if (pagenumber > 4) {
            startPoint = pagenumber - 4;
            endPoint = pagenumber + 4;
        }

        if (endPoint > pagecount) {
            startPoint = pagecount - 8;
            endPoint = pagecount;
        }

        if (startPoint < 1) {
            startPoint = 1;
        }

        // loop thru visible pages and render buttons
        for (var page = startPoint; page <= endPoint; page++) {

            var currentButton = $('<li class="page-number">' + (page) + '</li>');

            page == pagenumber ? currentButton.addClass('pgCurrent') : currentButton.click(function() { buttonClickCallback(this.firstChild.data); });
            currentButton.appendTo($pager);
        }

        // render in the next and last buttons before returning the whole rendered control back.
        $pager.append(renderButton('next', pagenumber, pagecount, buttonClickCallback)).append(renderButton('last', pagenumber, pagecount, buttonClickCallback));

        return $pager;
    }

    // renders and returns a 'specialized' button, ie 'next', 'previous' etc. rather than a page number button
    function renderButton(buttonLabel, pagenumber, pagecount, buttonClickCallback) {

        var $Button = $('<li class="pgNext">' + buttonLabel + '</li>');

        var destPage = 1;

        // work out destination page for required button type
        switch (buttonLabel) {
            case "first":
                destPage = 1;
                break;
            case "prev":
                destPage = pagenumber - 1;
                break;
            case "next":
                destPage = pagenumber + 1;
                break;
            case "last":
                destPage = pagecount;
                break;
        }

        // disable and 'grey' out buttons if not needed.
        if (buttonLabel == "first" || buttonLabel == "prev") {
            pagenumber <= 1 ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });
        }
        else {
            pagenumber >= pagecount ? $Button.addClass('pgEmpty') : $Button.click(function() { buttonClickCallback(destPage); });
        }

        return $Button;
    }

    // pager defaults. hardly worth bothering with in this case but used as placeholder for expansion in the next version
    $.fn.pager.defaults = {
        pagenumber: 1,
        pagecount: 1
    };

})(jQuery);