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我正在尝试将虚线应用于我的 Highcharts 折线图中的最后一列，但我无法找到解决方案。

这是我的 Highcharts 代码： 

      }
      xAxis: {
        type: 'datetime',
        dateTimeLabelFormats: { year: '%Y' },
        tickInterval: Date.UTC(2012, 0, 1) - Date.UTC(2011, 0, 1),
        title: { 
          text: 'Years', style: {color: '#333', fontFamily: 'sans-serif',}
        }
      }
      yAxis: { 
        tickInterval: 5,
        title: { 
          text: 'Points', style: {color: '#333', fontFamily: 'sans-serif'}
        }   
      },
      series: [{
        showInLegend: false
        color: '#000'
        pointInterval: 31557600000
        pointStart: Date.UTC(2005, 0, 1)
        data: [data['points_2005'], data['points_2006'], data['points_2007'], 
        data['points_2008'], data['points_2009'], data['points_2010'], data['points_2011'], 
        data['points_2012'], data['points_2013']]
          }]

我尝试使用以下代码编辑 2013 数据点：

{data['points_2013'], dashStyle: 'shortdot'}

我在这里附上了一张图片来解释。图片

谢谢你的帮助！

编辑：与以下评论相关的代码：

  series: [
    {
      showInLegend: false
      color: '#79C417'
      pointInterval: 31557600000
      pointStart: Date.UTC(2005, 0, 1)
  pointEnd: Date.UTC(2012, 0, 1)
      data: [searchData['points_2005'], searchData['points_2006'], searchData['points_2007'], searchData['points_2008'], searchData['points_2009'], searchData['points_2010'], searchData['points_2011'], searchData['points_2012']]
    }
    {
      showInLegend: false
      color: '#79C417'
      pointInterval: 31557600000
      pointStart: Date.UTC(2012, 0, 1)
  pointEnd: Date.UTC(2013, 0, 1)
      dashStyle: 'shortdot'
      data: searchData['points_2013']
    }
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