Change the background color of echarts histogram to dotted line

yAxis: {
          type: 'value',
          axisLine: {
            show: false//y轴不显示刻度线
          },
          axisTick: {
            show: false,
          },
          splitLine:{
            show:true,
            lineStyle:{
              type:'dashed'//背景色为虚线
            }
          }
        },