如何用canvas.js绘制双线图形？

<script src="https://canvasjs.com/assets/script/canvasjs.min.js"></script>

<div id="chartContainer" style="height: 300px; width: 100%;"></div>

// 创建图表配置对象
var chart = new CanvasJS.Chart("chartContainer", {
  title: {
    text: "双线图"
  },
  axisY: {
    title: "数值"
  },
  data: [
    {
      type: "line",
      name: "线1",
      dataPoints: [
        { x: 1, y: 10 },
        { x: 2, y: 15 },
        { x: 3, y: 25 },
        { x: 4, y: 30 },
        { x: 5, y: 28 }
      ]
    },
    {
      type: "line",
      name: "线2",
      dataPoints: [
        { x: 1, y: 20 },
        { x: 2, y: 25 },
        { x: 3, y: 30 },
        { x: 4, y: 35 },
        { x: 5, y: 40 }
      ]
    }
  ]
});

// 渲染图表
chart.render();