这是正确的，你需要建立你的自定义算法来创建设计的图表。例如，你可以添加另一个子点，并将其作为父点。下面的例子：

function customAlgorithm(parent, children) {
  const childrenAreas = [];
  const isSecondLevel = children[0].level === 2;
  let x = 0;

  children.forEach((child, index) => {
    const height = isSecondLevel ? parent.height / 2 : parent.height;
    const y = isSecondLevel ? parent.height / 2 : 0;

    if (isSecondLevel && index === 0) {
      childrenAreas.push({
        x: 0,
        y: 0,
        width: parent.width,
        height: parent.height / 2
      });
    } else {
      const width = isSecondLevel ?
        parent.width * (child.val / (parent.val - children[0].val)) :
        parent.width * (child.val / parent.val);

      childrenAreas.push({
        x,
        y,
        width,
        height
      });

      x += width;
    }
  });

  return childrenAreas;
}

Highcharts.seriesTypes.treemap.prototype.customAlgorithm = customAlgorithm;

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现场演示：https://jsfiddle.net/BlackLabel/z5v4wfme/
密码：https://www.highcharts.com/docs/chart-and-series-types/treemap