Highcharts JS：Sankey系列相互叠加而不是相互叠加

Question

我试图在一个图表区域内显示五个不同的系列（全部为Sankey类型）。我想让图表一个接一个地出现，但是，当我使用下面的代码时，图表会叠加在一起。

Highcharts.chart('chart', {

    title: {
        text: 'Highcharts Sankey Diagram'
    },

    series: [
        {
            curveFactor: 0,
            data: [
                {
                    from: 'Category 1',
                    to: 'Category 2',
                    weight: 5
                }, {
                    from: 'Category 2',
                    to: 'Category 3',
                    weight: 5
                }
            ],
            type: 'sankey'
        },
        {
            data: [
                {
                    from: 'Category 4',
                    to: 'Category 5',
                    weight: 5,
                    total: 400
                }, {
                    from: 'Category 5',
                    to: 'Category 6',
                    weight: 5
                }, {
                    from: 'Category 6',
                    to: 'Category 7',
                    weight: 5
                }, {
                    from: 'Category 7',
                    to: 'Category 8',
                    weight: 5
                }
            ],
            type: 'sankey'
        }
    ],

    chart: {
        backgroundColor: '#26303A'
    }

});

我已经尝试在stacking: null中设置plotOptions.series，但这似乎无效，因为无论如何都是默认值。