javascript - 工具提示中的 Google 折线图日期格式

Question

有没有办法更改 Google Chart 中工具提示的日期格式？我不想把它变成 HTML，因为它完全适合我的需要。我只想有其他日期格式。如您所见，我更改了 hAxis 的格式，并且我想对工具提示执行相同的操作。

var data = google.visualization.arrayToDataTable([[{"label":"Month","type":"date"},"Customers"],[new Date('2017-01-01'),30],[new Date('2017-02-01'),45],[new Date('2017-03-01'),55],[new Date('2017-04-01'),40],[new Date('2017-05-01'),20],[new Date('2017-06-01'),17],[new Date('2017-07-01'),15],[new Date('2017-08-01'),18],[new Date('2017-09-01'),0],[new Date('2017-10-01'),0],[new Date('2017-11-01'),0],[new Date('2017-12-01'),0]]);

var options = {"legend":{"position":"bottom"},"pointSize":5,"hAxis":{"format":"MMM","ticks":[new Date('2017-01-01'),new Date('2017-02-01'),new Date('2017-03-01'),new Date('2017-04-01'),new Date('2017-05-01'),new Date('2017-06-01'),new Date('2017-07-01'),new Date('2017-08-01'),new Date('2017-09-01'),new Date('2017-10-01'),new Date('2017-11-01'),new Date('2017-12-01')]},"height":300};

var c = new google.visualization.LineChart(document.getElementById("div-chartw0"));
c.draw(data, options);

Answer 1

在绘制图表之前格式化数据

var formatter = new google.visualization.DateFormat({pattern: 'MMM'});
formatter.format(data, 0);