分页代码核心

var maxIndex = 0;
var currentIndex = 1;
$n.pagation = {
    setpage : function(total, ajaxfc) {
        if (total != 0) {
            $("#pagediv").empty();
            if (total != -1) {
                maxIndex = Math.ceil(total / 10);
            }
            var indexs = 0;
            // 上确界
            var downlimit = 0;
            // 下确界
            var uplimit = 0;
            // 中间标记
            var middleflag = 0;
            if (maxIndex <= 5 || currentIndex <= 3) {
                downlimit = 1;
                if (maxIndex > 5) {
                    uplimit = 5;
                } else {
                    uplimit = maxIndex;
                }
                middleflag = 0;
            } else if (currentIndex > 3) {
                if (currentIndex > (maxIndex - 3)) {
                    downlimit = maxIndex - 4;
                    uplimit = maxIndex;
                    middleflag = 0;
                } else {
                    downlimit = currentIndex - 2;
                    uplimit = currentIndex + 2;
                    middleflag = 1;
                }
            }
            var pre = '<div class="dataTables_paginate paging_full_numbers" id="dyntable2_paginate">'
                    + '<span class="first paginate_button paginate_button_disabled" id="dyntable2_first">首页</span>'
                    + '<span class="previous paginate_button paginate_button_disabled" id="dyntable2_previous">上一页</span>';
            var middle = '';
            $("#indexspan").empty();
            var middlespan = "<span id='indexspan'>";

            for (var i = downlimit; i <= uplimit; i++) {
                if (middleflag == 0) {
                    if (i == currentIndex) {
                        middle = '<span class="paginate_active">' + i
                                + '</span>';
                    } else {
                        middle = '<span class="paginate_button">' + i
                                + '</span>';
                    }
                } else if (middleflag == 1) {
                    if (i == (uplimit - 2)) {
                        middle = '<span class="paginate_active">' + i
                                + '</span>';
                    } else {
                        middle = '<span class="paginate_button">' + i
                                + '</span>';
                    }
                }
                middlespan = middlespan + middle;
            }

            middlespan = middlespan + "</span>";
            var last = '<span class="next paginate_button paginate_button_disabled" id="dyntable2_next">下一页</span>'
                    + '<span class="last paginate_button paginate_button_disabled" id="dyntable2_last">末页</span>'
                    + '</div>';
            var pagation = pre + middlespan + last;
            $("#pagediv").append(pagation);

            $n.pagation.bindpageindexClick(ajaxfc);
        }
    },
    bindpageindexClick : function(ajaxfc) {
        $("#indexspan").children().bind("click", function() {
            currentIndex = parseInt($(this).text());
            $n.pagation.setpage(-1);
            ajaxfc(currentIndex);
        });
        $("#dyntable2_first").bind("click", function() {
            currentIndex = 1;
            $n.pagation.setpage(-1);
            ajaxfc(currentIndex);
        });
        $("#dyntable2_previous").bind("click", function() {
            var nowindex = $(".paginate_active").text();
            if (nowindex > 1) {
                currentIndex = parseInt($(".paginate_active").text()) - 1;
                $n.pagation.setpage(-1);
                ajaxfc(currentIndex);
            }
        });
        $("#dyntable2_next").bind("click", function() {
            var nowindex = $(".paginate_active").text();
            if (nowindex < maxIndex) {
                currentIndex = parseInt($(".paginate_active").text()) + 1;
                $n.pagation.setpage(-1);
                ajaxfc(currentIndex);
            }
        });
        $("#dyntable2_last").bind("click", function() {
            currentIndex = maxIndex;
            $n.pagation.setpage(-1);
            ajaxfc(currentIndex);
        });
    }
}

                        <div id="pagediv">
                            <div class="dataTables_paginate paging_full_numbers"
                                id="dyntable2_paginate">
                                <span class="first paginate_button paginate_button_disabled"
                                    id="dyntable2_first">首页</span> <span
                                    class="previous paginate_button paginate_button_disabled"
                                    id="dyntable2_previous">上一页</span> <span id="indexspan"><span
                                    class="paginate_active">1</span></span> <span
                                    class="next paginate_button paginate_button_disabled"
                                    id="dyntable2_next">下一页</span> <span
                                    class="last paginate_button paginate_button_disabled"
                                    id="dyntable2_last">末页</span>
                            </div>
                        </div>

ajaxfc为请求后台的ajax方法名