使用Chart js，我尝试对每7条垂直(x轴)网格线进行着色(从视觉上表示每周开始)

// 引入 Chart.js
import Chart from 'chart.js/auto';

// 创建图表实例
const ctx = document.getElementById('myChart').getContext('2d');
const myChart = new Chart(ctx, {
  type: 'line',
  data: {
    labels: ['Jan', 'Feb', 'Mar', 'Apr', 'May', 'Jun', 'Jul', 'Aug', 'Sep', 'Oct', 'Nov', 'Dec'],
    datasets: [{
      label: 'Sales',
      data: [65, 59, 80, 81, 56, 55, 40, 35, 45, 50, 60, 70],
      fill: false,
      borderColor: 'rgb(75, 192, 192)',
      tension: 0.1
    }]
  },
  options: {
    scales: {
      x: {
        grid: {
          drawOnChartArea: false
        },
        ticks: {
          callback: function(value, index, values) {
            if (index % 7 === 0) {
              return value;
            } else {
              return '';
            }
          }
        },
        gridLines: {
          drawBorder: false,
          color: function(context) {
            const index = context.tick.value;
            if (index % 7 === 0) {
              return 'rgba(0, 0, 255, 0.5)';
            } else {
              return 'transparent';
            }
          }
        }
      },
      y: {
        grid: {
          drawOnChartArea: true
        }
      }
    }
  }
});