echar的折线图的hover事件出现虚线

xAxis: {
type: 'category',
boundaryGap: false,
inverse: true,
axisLabel: {
show: true,
},
axisTick: {
show: false,
},
axisLine: {
lineStyle: {
color: 'rgba(0,0,0,.5)'
}
},
splitLine: {
show: true,
interval: modSl,
lineStyle: {
color: '#ccc',
type: 'solid',
}
},
data: dataName
},

splitLine: {
           show: true,
           lineStyle: {
               type: 'dashed'
           }
       },