我尝试将({type:'string',role:'annotation'})添加到烛台栏。但是注释并没有显示出来。有什么建议吗?
var data = new google.visualization.DataTable();
data.addColumn('string', 'label');
data.addColumn('number', '');
data.addColumn('number', '');
data.addColumn('number', '');
data.addColumn('number', '');
data.addColumn({type:'string', role:'annotation'});
data.addRows([
['Test1', 55,55,66,66,'test1'],
['Test1', 66,66,77,77,'test2'],
['Test1', 88,88,-99,-99,'test3'],
['Test1', -99,-99,66,66,'test4'],
]);
var options = {
..
}