javascript - 如果日期值小于当前日期，如何更改水平条的背景颜色？

Question

如果日期值小于当前日期，我想更改 highcharts(甘特图)中水平条的背景颜色？请看图:https://ibb.co/3MNqJJy这是 jsfiddle:https://jsfiddle.net/57n1cjyr/

var today = new Date().getTime(),
  day = 1000 * 60 * 60 * 24;
var options = {
    title: {
      text: 'Visual Planner Chart with Navigation',
    },
    xAxis: currentDateIndicator: true,
    min: today - 3 * day,
    max: today + 18 * day
  },
  yAxis: {
    uniqueNames: true

  },
  series: [{
    name: 'Visual Planner',
    data: [],
    dataLabels: {
      enabled: true,
      format: '{point.owner}'
    }
  }]
}

var ganttChart = Highcharts.ganttChart('container-ganttChart', options)

ganttChart.series[0].addPoint({
  start: Date.UTC(2019, 01, 30),
  end: Date.UTC(2019, 03, 01),
  name: 'crewRank',
  owner: 'crewName'
})

Answer 1

假设您按照上面的代码指定了 start 和 today，这似乎可以工作(用它替换最后一部分，其他代码未修改):

    var startDate=Date.UTC(2019, 01, 30)
    // call gantt chart then add series
    ganttChart.series[0].addPoint({
        start: startDate,
        end: Date.UTC(2019, 03, 01),
        name: 'crewRank',
        owner: 'crewName',
        color:  new Date(startDate).getTime() < today ? 'red' :'blue'
    }  

颜色为红色或蓝色，具体取决于当前日期值