vue 可视化大屏 项目开发中，需要折线图中显示最大值的label，这里我们通过lodash来获取数组的最大值，然后判断，如果当前值和最大值一致就显示对应区域的label

演示实例

组件代码

<template>
  <div class="echarts1" ref="echarts">
  </div>
</template>
<script>
import * as echarts from "echarts"
import lodash from "lodash";

export default {
  name: 'echarts1',
  components: {},
  props: {
    id: {
      type: String,
      default() {
        return ''
      }
    }
  },
  data() {
    return {
      status: '',
      active: false,
      xData: ['1月', '2月', '3月', '4月', '5月', '6月', '7月', '8月', '9月', '10月', '11月', '12月'],
      yData1: [10, 20, 30, 40, 20, 30, 20, 10, 20, 30, 38, 20]
    }
  },
  watch: {},
  mounted() {
    this.drawLine()
  },
  methods: {
    drawLine() {
      // 基于准备好的dom，初始化echarts实例
      window.addEventListener('resize', this.drawLine)
      let myChart = echarts.init(this.$refs.echarts)
      var max = lodash.max(this.yData1)
      console.log(max)
      var yData = []
      this.yData1.forEach((type) => {
        yData.push({
          value: type,
          label: {
            normal: {
              show: max == type,
              position: 'top',
              color: '#fff',
              align: 'center',
              fontWeight: 500,
              fontSize: 12
            }
          },
        })
      });
      console.log(yData)
      var option = {
        grid: {
          top: '30px',
          bottom: '20px',
          left: '20px',
          right: '20px',
          containLabel: true
        },
        tooltip: {
          trigger: 'axis',
          axisPointer: {
            type: 'shadow',
            shadowStyle: {
              color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{
                offset: 0,
                color: 'rgba(255, 174, 0, 0.1)'
              }, {
                offset: 1,
                color: 'rgba(255, 174, 0, 0.5)'
              }], false),
            }
          }
        },
        xAxis: [
          {
            data: this.xData,
            axisLabel: {
              margin: 10,
              color: 'rgba(202, 215, 245, 1)',
              textStyle: {
                fontSize: 14
              },
            },
            axisLine: {
              lineStyle: {
                color: 'rgba(49, 119, 214, 1)',
                width: 1
              }
            },
            splitLine: {
              show: false,
              lineStyle: {
                color: 'rgba(39, 76, 129, 0.26)',
                width: 1,
              }
            },
            axisTick: {
              show: false
            },
          }],
        yAxis: [
          {
            axisLabel: {
              color: 'rgba(202, 215, 245, 1)',
              textStyle: {
                fontSize: 14
              },
            },
            axisLine: {
              lineStyle: {
                color: 'rgba(49, 119, 214, 1)',
              }
            },
            axisTick: {
              show: false
            },
            splitLine: {
              show: true,
              lineStyle: {
                color: 'rgba(39, 76, 129, 0.26)',
                width: 1,
              }
            }
          }],
        series: [
          {
            name: '目标达成率',
            type: 'line',
            data: yData,
            smooth: true,
            symbol: 'circle', //数值点设定为实心点
            // symbolSize: 0, // 折线的点的大小
            itemStyle: {
              normal: {
                color: '#00fbd3', //点的颜色
                lineStyle: {
                  color: '#00fbd3', //线的颜色
                  width: 1, // 折线图线条粗细设置
                },
              },
            },
            areaStyle: {
              normal: {
                color: new echarts.graphic.LinearGradient(0, 0, 0, 1, [{
                  offset: 0,
                  color: 'rgba(0, 240, 203, 0.5)'
                },
                  {
                    offset: 1,
                    color: 'rgba(0, 240, 203, 0)'
                  }
                ], false),
              }
            },
          }]
      }
      myChart.clear()
      myChart.resize()
      myChart.setOption(option)
    },
  }
}
</script>

<style lang="scss" scoped>
.echarts1 {
  position: relative;
  width: 100%;
  height: 100%;
}
</style>