问题
I want to trace a vertical time line on the current day, but I didn't found solution on HighCharts documentation.
Like this :

回答1:
You're looking for a plot line. See the documentation here: http://api.highcharts.com/highcharts#xAxis.plotLines.
The basic format is:
xAxis: {
plotLines: [{
color: '#FF0000', // Red
width: 2,
value: 5.5 // Position, you'll have to translate this to the values on your x axis
}]
},
来源:https://stackoverflow.com/questions/21427943/how-to-draw-a-vertical-line-on-highcharts