chart.js改变网格

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 First dataset',
            backgroundColor: 'rgb(255, 99, 132)',
            borderColor: 'rgb(255, 99, 132)',
            data: [0, 10, 5, 2, 20, 30, 45]
        }]
    },
    options: {
        scales: {
            x: {
                grid: {
                    display: true,
                    color: 'rgba(0, 0, 0, 0.1)',
                    lineWidth: 1
                }
            },
            y: {
                grid: {
                    display: true,
                    color: function(context) {
                        if (context.tick.value === 0) {
                            return 'rgba(0, 0, 0, 0.2)';
                        } else {
                            return 'rgba(0, 0, 0, 0.1)';
                        }
                    },
                    lineWidth: 1
                }
            }
        }
    }
});