解决办法:  添加一个 seriesName  lable用seriesName

<template>
  <div ref="EchartLiquidfill" class="EchartLiquidfill" :style="{ width: width }" />
</template>

<script>
export default {
  name: "EchartLiquidfill",
  props: {
    num: {
      type: Number,
      default: 0
    },
    lableName: {
      type: String,
      default: ""
    },
    width: {
      type: String,
      default: "100%"
    },

    title: {
      type: String,
      default: "出租率"
    }
  },
  data() {
    return {
      description: "水球图",
      labelColor: "#FFFFFF",
      waterAllColor: null,
     
    };
  },
  created() {
    this.$nextTick(() => {
      if (this.title === "出租率") {
        this.waterAllColor = {
          waterColor: ["#19B860", "#43E48B"],
          bgColor: "#E4FFF0"
        };
      } else {
        this.waterAllColor = {
          waterColor: ["#D94854", "#e19393"],
          bgColor: "#fce7e7"
        };
      }

      if (this.num < 0.5) {
        this.labelColor = "#F12D25";
      } else {
        this.labelColor = "#FFFFFF";
      }
    });
  },
  mounted() {
    this.$nextTick(() => {
      this.drawChartWater(this.num);
    });
  },
  methods: {
    /** echart 水球图 测试*/

    drawChartWater(num) {
      let self = this;
      // const chartDom = document.getElementsByClassName("EchartLiquidfill");
      const chartDom = this.$echarts.init(this.$refs.EchartLiquidfill);
      const option = {
        title: {
          text: this.title,
          x: "center", // 水平安放位置，默认为'left'，可选为：'center' | 'left' | 'right' | {number}（x坐标，单位px）
          y: "bottom", // 垂直安放位置，默认为top，可选为：'top' | 'bottom' | 'center' | {number}（y坐标，单位px）
          textStyle: {
            fontSize: 16,
            fontFamily: "PingFangSC-Regular, PingFang SC",
            fontWeight: 800,
            color: "#667382"
          }
        },

        series: [
          {
            name: this.lableName,
            type: "liquidFill",
            data: [num],
            color: this.waterAllColor.waterColor,
            center: ["50%", "50%"],
            radius: "65%",
            outline: {
              show: false
            },
            backgroundStyle: {
              color: this.waterAllColor.bgColor
            },
            itemStyle: {
              opacity: 0.95,
              shadowBlur: 50,
              shadowColor: "rgba(255, 255, 255, .1)"
            },
            label: {
              position: ["50%", num > 0.6 ? "60%" : "50%"],
              fontSize: 20,
              color: this.labelColor,

              formatter: function(params) {
                // console.log(params,"params")
                if (self.lableName) {
                  return params.seriesName;
                } else {
                  return params.value * 100 + "%";
                }
              }
            }
          }
        ]
      };
      // chartDom.forEach((item) => {
      //   const myChart = this.$echarts.init(item);
      // myChart.setOption(option);
      chartDom.setOption(option);
      // });
    }
  }
};
</script>
<style scoped>
.EchartLiquidfill {
  height: calc(28vh - 10vh);
}
</style>