当我为数据标签使用标注形状时，一些三角形指针丢失了
some Triangle pointers are missing when I use callout shape for datalabels
look at the bellow example only last data label has triangle pointing shape
I wanted all label's to have a triangle pointer.
当所有标签都呈现在该点上方或下方时，callout shape 工作正常。
演示：https://jsfiddle.net/BlackLabel/dey08qLh/
API: https://api.highcharts.com/highcharts/series.line.dataLabels.shape
look at the bellow example only last data label has triangle pointing shape
I wanted all label's to have a triangle pointer.
当所有标签都呈现在该点上方或下方时，callout shape 工作正常。
演示：https://jsfiddle.net/BlackLabel/dey08qLh/
API: https://api.highcharts.com/highcharts/series.line.dataLabels.shape