在折线图chart.js中中断y轴

<canvas id="myChart"></canvas>

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'line',
    data: {
        labels: ['January', 'February', 'March', 'April', 'May', 'June', 'July'],
        datasets: [{
            label: 'My Dataset',
            data: [10, 20, 30, 40, 50, 60, 70],
            fill: false,
            borderColor: 'rgb(75, 192, 192)',
            tension: 0.1
        }]
    },
    options: {
        scales: {
            y: {
                beginAtZero: true,
                max: 100,
                ticks: {
                    stepSize: 20
                }
            }
        }
    }
});

options: {
    scales: {
        y: {
            beginAtZero: true,
            max: 100,
            ticks: {
                stepSize: 20,
                callback: function(value, index, values) {
                    if (value === 50 || value === 60) {
                        return null; // 隐藏50和60刻度线
                    }
                    return value;
                }
            }
        }
    }
}