获取jQuery DataTables 的checked选中行

$(function () {

var  tabel = $('#userlist').DataTable({
        destroy: true, //Cannot reinitialise DataTable,解决重新加载表格内容问题  
        bProcessing: true,           //DataTables载入数据时，是否显示‘进度’提示  
        bStateSave: false,          //是否打开客户端状态记录功能,此功能在ajax刷新纪录的时候不会将个性化设定回复为初始化状态  
        aLengthMenu: [10, 20, 40, 60, 100, 1000], //更改显示记录数选项  
        iDisplayLength: 10,        //默认显示的记录数  
        bInfo: true,              //是否显示页脚信息，DataTables插件左下角显示记录数  
        bPaginate: true,         //是否显示（应用）分页器  
        autoWidth: true,        //是否自适应宽度  
        bScrollCollapse: true, //是否开启DataTables的高度自适应，当数据条数不够分页数据条数的时候，插件高度是否随数据条数而改变  
        sPaginationType: "full_numbers", //详细分页组，可以支持直接跳转到某页  
        bSort: false,        //是否启动各个字段的排序功能  
        bFilter: true,      //是否启动过滤、搜索功能        
        bServerSide: true, //开启此模式后，你对datatables的每个操作 每页显示多少条记录、下一页、上一页、排序（表头）、搜索，这些都会传给服务器相应的值。
        "ajax": {
            url: "/Ajax/UserMgrAjax.ashx?cmd=userList",
            type: "POST"

},
        columns: [
            {
                "sWidth": "4%",
                "sClass": "text-center",
                "data": null,
                "targets": 0
            },
             {
                 "sWidth": "4%",
                 "sClass": "text-center",
                 "data": "u_id",
                 "render": function (data, type, full, meta) {//这里就是要显示的checkbox多选框了
                  
                     return '<input type="checkbox"  class="checkchild"  value="' + data + '" />';
                 },
                 "bSortable": false
             },

{ "sClass": "text-center", "data": "u_name" },
             { "sClass": "text-center", "data": "u_tel" },
             {
                 "sClass": "text-center",
                 "data": "u_sex",
                 "render": function (data, type, row, meta) {

var content = "保密";
                     if (data == "1")
                         content = "男";
                     if (data == "2")
                         content = "女";
                     return content;
                 }

},
             { "sClass": "text-center", "data": "u_age" },
             { "sClass": "text-center", "data": "u_registerdate" },
             {
                 "sClass": "text-center",
                 "data": "u_state",
                 "render": function (data, type, row, meta) {
                     var content = "非正常";
                     if (data == "0")
                         content = "正常";
                     if (data == "1")
                         content = "锁定";
                     return content;
                 }
             },
             {
                 "sClass": "text-center",
                 "data": "u_registerdate",
                 render: function (data, type, row, meta) {
                     
                     return "<a id='edit' title='编辑' class='glyphicon glyphicon-edit nounderline' href='javascript:Edit("+row.u_id+");'></a>";
                 }
             }

],
        //这个应该是重绘的回调函数
        fnDrawCallback: function () {
            var startIndex = this.api().context[0]._iDisplayStart;//获取到本页开始的条数
            this.api().column(0).nodes().each(function (cell, i) {
                //翻页序号连续
                cell.innerHTML = startIndex + i + 1;

});
        },
    });

//------------------------------------------------------------------------------------------------------------------------------------------

//删除
    $("#del").click(function () {
        var ids = "";
        $('.checkchild').each(function () {
            if ($(this).is(':checked')) {
                ids += $(this).val()+",";
            }
        });
        if (ids != "") {
            $.ajax({
                type: "Post",
                url: "UserList.aspx/DelUser",
                //方法传参的写法一定要对，str为形参的名字  
                data: "{'ids':'" + ids + "' }",
                contentType: "application/json; charset=utf-8",
                dataType: "json",
                success: function (data) {
                    //返回的数据用data.d获取内容  
                    UserList();
                    layer.msg(data.d);
                }
            });
        } else {
            layer.msg("请选择行",{offset: ['300px', '700px']});
            return;
        }

});

});