【前端】echarts折线图中画水平参考线辅助线

示例1

在series中新添加一个data用于绘画参考线，以自定义名字作为显示

option={
  xAxis: {
    data: ['A', 'B', 'C', 'D', 'E'],
    boundaryGap: true,
    splitArea: {
      show: true
    }
  },
  yAxis: {
    max: 2
  },
  series: [
    {
      name: 'line',
      type: 'line',
      stack: 'all',
      symbolSize: 6,
      data: [0.3, 1.4, 1.2, 1, 0.6],
    },
    {
      name: 'line',
      type: 'line',
      stack: 'all',
      symbolSize: 6,
      markLine: {
      	data: [
	          {
		    "name": "start",
		    "yAxis": 1.8,
		    "label": {
		      "formatter": "{b}",
		      "position": "end"
		    }
		  },
          ],
        label: {
          distance: [20, 8],
        }
      }
    }
  ],
  grid: {
    top: 30,
    left: 60,
    right: 60,
    bottom: 40
  }
};

示例2

画两条参考线，并以具体值作为标签显示

option={
  xAxis: {
    data: ['A', 'B', 'C', 'D', 'E'],
    boundaryGap: true,
    splitArea: {
      show: true
    }
  },
  yAxis: {
    max: 2
  },
  series: [
    {
      name: 'line',
      type: 'line',
      stack: 'all',
      symbolSize: 6,
      data: [0.3, 1.4, 1.2, 1, 0.6],
    },
    {
      name: 'line',
      type: 'line',
      stack: 'all',
      symbolSize: 16,
      markLine: {
        data: [
                {"name": "start","yAxis": 1.8,}, {"name": "ssss","yAxis": 0.5,},
          ],
        label: {
          distance: [20, 8],
        }
      }
    }
  ],
};

示例3

在已有折线数据中，添加最大值、最小值、平均值

option={
  xAxis: {
    data: ['A', 'B', 'C', 'D', 'E'],
    boundaryGap: true,
    splitArea: {
      show: true
    }
  },
  yAxis: {
    max: 2
  },
  series: [
    {
      name: 'line',
      type: 'line',
      stack: 'all',
      symbolSize: 6,
      data: [0.3, 1.4, 1.2, 1, 0.6],
      markLine: {
        data: [{ type: "max", name: "Max" },{ type: "min", name: "Min" },{ type: "average", name: "Avg" }],
      },
    },
  ],
};