您可以使用plotLines
选项添加分隔符:
yAxis: {
plotLines: [{
value: 100,
width: 4,
color: '#fff',
zIndex: 4
}],
...
}
实时演示: https://jsfiddle.net/BlackLabel/1mj80dc6/
API参考: https://api.highcharts.com/highcharts/yAxis.plotLines