option = {
  title: {
      text: '折线图堆叠'
  },
  tooltip: {
      trigger: 'axis'
  },
  legend: {
      data: ['邮件营销']
  },
  grid: {
      left: '3%',
      right: '4%',
      bottom: '3%',
      containLabel: true
  },
  xAxis: {
      type: 'category',
      boundaryGap: false,
      data: ['周一', '周二', '周三', '周四', '周五', '周六', '周日']
  },
  yAxis: {
      type: 'value'
  },
  series: [
      {
          name: '邮件营销',
          type: 'line',
          stack: '总量',
          data: [120, 132, 101, 134, 90, 230, 210]
      }
  ]
};
