删除chart.js条形图中的删除线行为

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

var ctx = document.getElementById('myChart').getContext('2d');
var myChart = new Chart(ctx, {
    type: 'bar',
    data: {
        labels: ['数据1', '数据2', '数据3'],
        datasets: [{
            label: '数据集',
            data: [10, 20, 30],
            backgroundColor: 'rgba(0, 123, 255, 0.5)',
            borderColor: 'rgba(0, 123, 255, 1)',
            borderWidth: 1
        }]
    },
    options: {
        scales: {
            y: {
                beginAtZero: true
            }
        }
    }
});

Chart.plugins.register({
    afterDraw: function(chart) {
        var ctx = chart.ctx;
        chart.data.datasets.forEach(function(dataset, index) {
            var meta = chart.getDatasetMeta(index);
            if (!meta.hidden) {
                meta.data.forEach(function(element, index) {
                    var data = dataset.data[index];
                    if (data < 0) {
                        var x = element.tooltipPosition().x;
                        var y = element.tooltipPosition().y;
                        ctx.save();
                        ctx.beginPath();
                        ctx.moveTo(x - 5, y - 5);
                        ctx.lineTo(x + 5, y + 5);
                        ctx.moveTo(x + 5, y - 5);
                        ctx.lineTo(x - 5, y + 5);
                        ctx.strokeStyle = 'red';
                        ctx.lineWidth = 2;
                        ctx.stroke();
                        ctx.restore();
                    }
                });
            }
        });
    }
});