初接触dataTables。想将表格导出为csv文件，希望大神们帮帮忙！！

下面是我初始化dataTable的代码
$('#sample-table-2')

            .dataTable( {

                bAutoWidth: false,
                "aoColumns": [
                  { "bSortable": false },
                  null, null,null, null, null,null,
                  { "bSortable": false }

                ],
                "aaSorting": [],

// "searching":false,
// "bFilter":null,
// "sSearch":true,

                "oLanguage": {"sSearch": '搜索:'},
                "sDom":
                    "<'row'<'col-xs-6'l><'toolbar'f>r>"+
                    "t"+
                    "<'row'<'col-xs-6'i><'col-xs-6'p><'bottom'>>",
                "oTableTools": {
                    "aButtons": [
                        {
                        "sExtends": "csv",
                        "sButtonText": "导出Excel",
                        "sCharSet": "utf8"
                        }
                    ]
                }

            } );

            $("div.bottom").html('<button style="color:#f78234" onclick="">导出csv文件</button');