(function ($) {//p为当前页面,pn为总页数
    $.fn.pagenav = function (options) {
        options = $.extend({}, $.fn.pagenav.defaults, options || {});
        return this.each(function () {
            $(this).attr("class", options.cssclass);
            $(this).css("width", options.width);
            $(this).empty().append(renderpage(parseint(options.p), parseint(options.pn), options.pageclick));
            $("#pagenav span.normal").mouseover(function () { document.body.style.cursor = "pointer"; }).mouseout(function () { document.body.style.cursor = "auto"; });
        });
    };
    function renderpage(p, pn, pageclick) {
        var $page = $("<div id='pagenav'></div>");
        if (!p) { p = 1; }
        if (!pn) { pn = 1; }
        $page.append(renderbutton("上一页", p, pn, pageclick));
        var start = 1;
        var end = (pn < 10) ? pn : 10;
        if (p > 8) {
            $page.append("...");
            start = p - 4;
            var e = p + 4;
            end = (pn < e) ? pn : e;
        }
        for (var i = start; i < end; i++) {
            $page.append(renderpagelink(i, p, pageclick));
        }
        if (p + 4 < pn) { $page.append("..."); }
        $page.append(renderpagelink(pn, p, pageclick)).append(renderbutton("下一页", p, pn, pageclick));
        return $page;
    }
    function renderpagelink(index, p, pageclick) {
        var $link = $("<span>" + index + "</span>");
        index == p ? $link.addclass("current") : $link.addclass("normal").click(function () { pageclick(index); });
        return $link;
    }
    function renderbutton(btn, p, pn, pageclick) {
        var $button = $("<span>" + btn + "</span>");
        var destpage = 1;
        switch (btn) {
            case "上一页":
                destpage = p - 1;
                break;
            case "下一页":
                destpage = p + 1;
                break;
        }
        if (btn == "上一页") {
            p <= 1 ? $button.addclass("disabled pagerprev") : $button.addclass("normal pagerprev").click(function () { pageclick(destpage); });
        }
        else {
            p == pn ? $button.addclass("disabled pagernext") : $button.addclass("normal pagernext").click(function () { pageclick(destpage); });
        }
        return $button;
    };
    $.fn.pagenav.defaults = { width: 700, cssclass: "sabrosus", pretext: "上一页", nexttext: "下一页", p: 1, pn: 1 };
})(jquery);