如何在chart.js中动态更改yAxes

var myChart;

document.addEventListener("DOMContentLoaded", function() {
  var ctx = document.getElementById("myChart").getContext("2d");
  myChart = new Chart(ctx, {
    type: "line",
    data: {
      labels: ["Label 1", "Label 2", "Label 3", "Label 4", "Label 5"],
      datasets: [{
        label: "Dataset 1",
        data: [10, 20, 30, 40, 50],
        backgroundColor: "rgba(0, 0, 255, 0.5)"
      }]
    },
    options: {
      scales: {
        yAxes: [{
          ticks: {
            beginAtZero: true
          }
        }]
      }
    }
  });
});

function changeYAxes() {
  myChart.options.scales.yAxes[0].ticks.beginAtZero = false;
  myChart.update();
}