;(function($) {    var defaults = {        pagecurrent: 1,   //当前页码        pagecount:1,      //页码总数        first_text: ‘首页‘,  //首页按钮的文字可自定义        prev_text: ‘上一页‘, //上一页按钮的文字可自定义        next_text: ‘下一页‘, //下一页按钮的文字可自定义        last_text: ‘尾页‘,  //尾页按钮的文字可自定义        max_per_page: 5 //每屏最多显示多少个页码    };    $.fn.pager = function(options) {        var options = $.extend({}, defaults, options);        return this.each(function() {            $(this).empty().append(renderPage(options));        });    };    function renderPage(opts) {        var pagecurrent = parseInt(opts.pagecurrent);        var pagecount = parseInt(opts.pagecount);        var btncallback = opts.btncallback;        var max_per_page = parseInt(opts.max_per_page);        var first_text = opts.first_text;        var prev_text = opts.prev_text;        var next_text = opts.next_text;        var last_text = opts.last_text;        //页码wrap        var pageWrap = $(‘<ul class="page"></ul>‘);        //添加第一页和上一页按钮        pageWrap.append(renderBtn(‘first‘, first_text, pagecurrent, pagecount, btncallback))            .append(renderBtn(‘prev‘,prev_text, pagecurrent, pagecount, btncallback));        //控制一屏最多显示n条页码        var startNum = 1;        var endNum = max_per_page;        var point = Math.ceil((endNum - startNum) / 2);        if (pagecurrent > point) {            startNum = pagecurrent - point;            endNum = pagecurrent + point;        }        if (endNum > pagecount) {            startNum = pagecount - max_per_page + 1;            endNum = pagecount;        }        if (startNum < 1) {            startNum = 1;        }        //渲染页码列表        for (var pagenumber = startNum; pagenumber <= endNum; pagenumber++) {            var pagebtn = $(‘<li>‘+ pagenumber +‘</li>‘);            if (pagenumber == pagecurrent) {                pagebtn.addClass(‘current‘);            }            else {                pagebtn.click(function() {                    btncallback(this.innerHTML);                });            }            pageWrap.append(pagebtn);        }        //渲染下一页和尾页按钮        pageWrap.append(renderBtn(‘next‘, next_text, pagecurrent, pagecount, btncallback))            .append(renderBtn(‘last‘, last_text, pagecurrent, pagecount, btncallback));        return pageWrap;    }    //首页，上一页，下一页，尾页按钮的方法    function renderBtn(btntype, btntext, pagecurrent, pagecount, btncallback) {        var button = $(‘<li>‘+ btntext +‘</li>‘);        var destPage = 1;        switch (btntype) {            case ‘first‘:                destPage = 1;                break;            case ‘prev‘:                destPage = pagecurrent - 1;                break;            case ‘next‘:                destPage = pagecurrent + 1;                break;            case ‘last‘:                destPage = pagecount;        }        if (btntype == ‘first‘ || btntype == ‘prev‘) {            if (pagecurrent <= 1) {                button.addClass(‘disable‘);            }            else {                button.click(function() {                    btncallback(destPage);                });            }        }        else {            if (pagecurrent >= pagecount) {                button.addClass(‘disable‘);            }            else {                button.click(function() {                    btncallback(destPage);                });            }        }        return button;    }})(jQuery);/** * Created by joesbell on 2016/9/29. */