在google charts中定制haxis标签

google.charts.load('current', {packages: ['corechart']});
google.charts.setOnLoadCallback(drawChart);

function drawChart() {
  var data = google.visualization.arrayToDataTable([
    ['Year', 'Sales'],
    ['2016', 1000],
    ['2017', 1170],
    ['2018', 660],
    ['2019', 1030]
  ]);

  var options = {
    hAxis: {
      format: 'MMM d, y',
      ticks: ['2016-01-01', '2017-01-01', '2018-01-01', '2019-01-01'],
      viewWindow: {
        min: '2015-01-01',
        max: '2020-01-01'
      },
      gridlines: {
        count: 5
      },
      direction: 1
    }
  };

  var chart = new google.visualization.LineChart(document.getElementById('chart_div'));
  chart.draw(data, options);
}