在Chart.js中，当Y轴上的值降到0以下时，如何消除添加到底部的额外空间？

var chartOptions = {
  scales: {
    y: {
      beginAtZero: true
    }
  }
};

var chartData = {
  labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
  datasets: [{
    label: 'My Dataset',
    data: [10, 5, -3, -8, 2, 6, 4],
    backgroundColor: 'rgba(0, 123, 255, 0.5)'
  }]
};

var chartConfig = {
  type: 'bar',
  data: chartData,
  options: chartOptions
};

var myChart = new Chart(document.getElementById('myChart'), chartConfig);