var provinces = res.res;
var html = [];
var option_select='<option value="" >请选择</option>';
var tpl = '<option value="{1}" data-id="{1}" data-name="{0}">{0}</option>';
html.push(option_select);
 
$.each(provinces, function (i, n) {
<span style="white-space:pre">	</span>html.push(tpl.format(n.name, n.id));
});
//alert(html.join());
$('#class').html(html.join(''));

function getXueke() {
		var gradeId = $('#grade_id').val();
		if (gradeId == '') {
			$('#textbook_id').html('<option value="">-选择-</option>');
			return;
		}
		$.get('index.php"{0}">{1}</option>'.format(item.id, item.course_name));
			});
			if (options.length > 0) {
				$('#textbook_id').html(options.join(''));
			} else {
				$('#textbook_id').html('<option value="">-请选择-</option>');
			}
		})
	}