Chartjs -在xAxes处插入标签

var chartData = {
  labels: ['January', 'February', 'March', 'April', 'May', 'June'],
  datasets: [{
    label: 'Sales',
    data: [120, 150, 180, 200, 220, 250],
    backgroundColor: 'rgba(0, 123, 255, 0.5)'
  }]
};

var chartOptions = {
  scales: {
    xAxes: [{
      ticks: {
        beginAtZero: true
      },
      scaleLabel: {
        display: true,
        labelString: 'Month'
      }
    }],
    yAxes: [{
      ticks: {
        beginAtZero: true
      },
      scaleLabel: {
        display: true,
        labelString: 'Sales'
      }
    }]
  }
};

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
  type: 'bar',
  data: chartData,
  options: chartOptions
});