到下拉框
            function init_data_sources() {
                $.ajax({
                    type: 'POST',
                    url: server_context+"/data_sources_list",
                    dataType: 'json',
                    async: false,
                    data: '',
                    //成功返回
                    success: function (data) {
                        if(data.code != "200"){
                            layer.msg(data.msg);
                            return ;
                 