datatables使用ajax获取数据

前端：

//初始化datatable
var table3 = $('.jiaoshi_lst').DataTable({
        "processing": true,
        "serverSide": true,
        "paging": true,
        "ordering": false,
        "searching": false,
        "select": true,
        "ajax": {
            url: "get_lst",
            type: "get",
            dataType: 'json'
        },
        "columns": [
            {
                'data': null,
                "render": function (data, type, full, meta) {
                    var div = `<div class="dt-checkbox">
                                        <input type="checkbox" name="select_all" value="`+ data.id + `" id="example-select-all">
                                        <span class="dt-checkbox-label"></span>
                                    </div>`;
                    return div;
                }
            },
            { 'data': 'id' },
            { 'data': 'classroom' },
            { 'data': 'area' },
            { 'data': 'loudong' },
            {
                'data': 'id',
                "render": function (data, type, full, meta) {
                    var div = `<a href="javascript:;" class="btn-sm btn-primary btn-edit mm-margin-right"><i class='fa fa-pencil'></i></a> <a href="javascript:;" class="btn-sm btn-danger btn-del"    data-uid="${data}"><i class='fa fa-times'></i></a>`;
                    return div;
                }
            },
        ]
    });

后台：

 function room_get_lst()
  {
    $offset = $this->input->get('start');
    $pager = $this->input->get('length');
    $result = [
      'draw' => $this->input->get('draw'),
      'recordsTotal' => $this->db->get('shebei')->num_rows(),
      'recordsFiltered' => $this->db->get('shebei')->num_rows(),
      'data' => $this->db->select('id,area,loudong,classroom')->limit($pager, $offset)->get('jiaoshi')->result_array()
    ];

    $rs = json_encode($result);
    die($rs);
    echo $rs;
  }

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