Chart.js:在两行之间填充背景

<script src="https://cdn.jsdelivr.net/npm/chart.js"></script>

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

var ctx = document.getElementById('myChart').getContext('2d');
var 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],
            fill: true, // 设置为true以填充背景
            backgroundColor: 'rgba(255, 0, 0, 0.5)' // 设置填充颜色
        }, {
            label: 'Dataset 2',
            data: [50, 40, 30, 20, 10],
            fill: true,
            backgroundColor: 'rgba(0, 0, 255, 0.5)'
        }]
    },
    options: {
        // 其他配置选项
    }
});