markPoint 折线图标记

折线图标记，参考 https://echarts.apache.org/examples/zh/editor.html?c=line-marker

{
  series: [
    {
      name: 'Highest',
      type: 'line',
      symbol: 'none',
      markPoint: {
        symbol: 'pin', // 标记类型
        symbolSize: 40, // 图形大小
        data: [
          {
            value: '开始时间', // 黄点
            xAxis: 2, // data[index]
            yAxis: 116, // data.value
            itemStyle: {
              normal: {
                color: '#fac858',
                opacity: 0.8,
                label: {
                  show: true,
                },
              },
            },
          },
          {
            value: '结束时间',
            xAxis: 37,
            yAxis: 117,
            itemStyle: {
              normal: {
                color: '#5470c6',
                opacity: 0.8,
                label: {
                  show: true,
                },
              },
            },
          },
        ],
      }
    }
  ];
}