柱状图在所有数值均相同的情况下，Y坐标轴的最大值和最小值会失效。

[Cyrusky]

配置项如：

options:
{
        legend: {
          data: [
            {
              name: '业务可用性',
              color: '#3de7c9'
            }
          ],
          y: 'top',
          textStyle: {
            fill: '#fff'
          }
        },
        xAxis: {
          data: [
            '2019-12-10', '2019-12-11',
            '2019-12-12', '2019-12-13',
            '2019-12-14', '2019-12-15',
            '2019-12-16', '2019-12-17',
            '2019-12-18', '2019-12-19'],
          axisLine: {
            style: {
              stroke: '#999'
            }
          },
          axisLabel: {
            style: {
              fill: '#999'
            }
          },
          axisTick: {
            show: false
          }
        },
        yAxis: {
          data: 'value',
          min: 80,
          splitLine: {
            show: false
          },
          axisLine: {
            style: {
              stroke: '#999'
            }
          },
          axisLabel: {
            style: {
              fill: '#999'
            }
          },
          axisTick: {
            show: false
          }
        },
        series: [
          {
            name: '业务可用性',
            data: [100, 100, 100, 100, 100, 100, 100, 100, 100, 100],
            type: 'line',
            smooth: true,
            lineArea: {
              show: true,
              gradient: ['rgba(55, 162, 218, 0.6)', 'rgba(55, 162, 218, 0)']
            },
            lineStyle: {
              lineDash: [5, 5]
            },
            linePoint: {
              radius: 4,
              style: {
                fill: '#00db95'
              }
            }
          }
        ]
      }