(function ($) {
    $.fn.pager = function (options) { var opts = $.extend({}, $.fn.pager.defaults, options); return this.each(function () { $(this).empty().append(renderpager(parseInt(options.pagenumber), parseInt(options.pagecount), options.buttonClickCallback)); $('.pages li').mouseover(function () { document.body.style.cursor = "pointer"; }).mouseout(function () { document.body.style.cursor = "auto"; }); }); }; function renderpager(pagenumber, pagecount, buttonClickCallback) {
        var $pager = $('<ul class="pages"></ul>'); $pager.append(renderButton('首页', pagenumber, pagecount, buttonClickCallback)).append(renderButton('上一页', pagenumber, pagecount, buttonClickCallback)); 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; }
        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); }
        $pager.append(renderButton('下一页', pagenumber, pagecount, buttonClickCallback)).append(renderButton('尾页', pagenumber, pagecount, buttonClickCallback)); return $pager;
    }
    function renderButton(buttonLabel, pagenumber, pagecount, buttonClickCallback) {
        var $Button = $('<li class="pgNext">' + buttonLabel + '</li>'); var destPage = 1; switch (buttonLabel) { case "首页": destPage = 1; break; case "上一页": destPage = pagenumber - 1; break; case "下一页": destPage = pagenumber + 1; break; case "尾页": destPage = pagecount; break; }
        if (buttonLabel == "首页" || buttonLabel == "上一页") { pagenumber <= 1 ? $Button.addClass('pgEmpty') : $Button.click(function () { buttonClickCallback(destPage); }); }
        else { pagenumber >= pagecount ? $Button.addClass('pgEmpty') : $Button.click(function () { buttonClickCallback(destPage); }); }
        return $Button;
    }
    $.fn.pager.defaults = { pagenumber: 1, pagecount: 1 };
})(jQuery);