255, 255, 0.5)',
                xAxis: {
                    type: 'category',
                    boundaryGap: false
                },
                yAxis: {
                    type: 'value',
                    boundaryGap: [0, '30%']
                },
                visualMap: {
                    type: 'piecewise',
                    show: false,
                    dimension: 0,
                    seriesIndex: 0,
                    pieces: [{
                        gt: 1,
  