阶梯图echarts category配置项内容和展示

      option = {
  title: {
    text: '阶梯图'
  },
  tooltip: {
    trigger: 'axis',
    axisPointer: {
      type: 'shadow'
    },
    formatter: function (params) {
      let tar;
      if (params[1].value !== '-') {
        tar = params[1];
      } else {
        tar = params[0];
      }
      return tar.name + '<br/>' + tar.seriesName + ' : ' + tar.value;
    }
  },
  legend: {
    data: ['Expenses', 'Income']
  },
  grid: {
    left: '3%',
    right: '4%',
    bottom: '3%',
    containLabel: true
  },
  xAxis: {
    type: 'category',
    data: (function () {
      let list = [];
      for (let i = 1; i <= 11; i++) {
        list.push('Nov ' + i);
      }
      return list;
    })()
  },
  yAxis: {
    type: 'value'
  },
  series: [
    {
      name: '',
      type: 'bar',
      stack: 'Total',
      itemStyle: {
        borderColor: 'transparent',
        color: 'transparent'
      },
      emphasis: {
        itemStyle: {
          borderColor: 'transparent',
          color: 'transparent'
        }
      },
      data: [0, 900, 1245]
    },
    {
      name: 'Income',
      type: 'bar',
      stack: 'Total',
      label: {
        show: true,
        position: 'top'
      },
      itemStyle: {
           barBorderRadius: 120,
           color: 'red',
      },
      data: [900, 345, 393,]
    },
   
  ]
};