解决vue⼀个页面中复用同⼀个echarts组件的问题

组件封装调用 

1.如果是单个组件只需要使用一次的话

var chartDom = document.getElementById('map'); 

2.如果需要多次复用这个组件的话，我们可以使用 $refs 

 this.myChart = echarts.init(this.$refs.chartDom); 

子组件源码 

<template>
  //地图容器
  <div id="map" ref="chartDom"></div>
</template>
<script>
const echarts = require("echarts/lib/echarts");
//引入地图json文件
export default {
  name: "map",
  props: ["chart", "inRange"],
  data() {
    return {
      chartData: [],
      myChart: null
    };
  },
  destroyed() {
    window.removeEventListener("resize", this.resizeFn, true);
    this.myChart.dispose();
  },
  watch: {
    chart: {
      handler: function(val) {
        this.$nextTick(() => {
          let clientHeight = Math.floor(document.getElementsByClassName("layout")[0].offsetHeight);
          this.barWidth = Math.floor(clientHeight * 0.013);
          this.chartData = val;
          this.initChart();
        });
      },
      immediate: true
    }
  },
  mounted() {},
  methods: {
    initChart() {
      echarts.registerMap(json);
      //只需要调用一次
       var chartDom = document.getElementById('map');
      this.myChart = echarts.init(chartDom);
      //多次复用使用
      this.myChart = echarts.init(this.$refs.chartDom);
      let data = [];
      let maxSnqncl = 0;
      this.chartData.forEach(item => {
        data.push({
          name: item.xzqhmc,
          value: item.dncls
        });
        if (item.dncls > maxSnqncl) {
          maxSnqncl = item.dncls;
        }
      });
      var option;

      option = {
        grid: {
          left: "20%",
          containLabel: true
        },
        visualMap: {
          min: 0,
          max: maxSnqncl,
          bottom: 0,
          left: 10,
          itemWidth: 10,
          itemHeight: 60,
          text: "项目数量",
          realtime: true,
          calculable: true,
          inRange: {
            // color: ['#193369', '#0488F8']
            color: [this.inRange[0], this.inRange[1]]
          },
          textStyle: {
            color: "#ccc"
          }
        },
        series: [
          {
            type: "map",
            map: "zibo",
            zoom: 1.26,
            label: {
              normal: {
                show: true,
                color: "#ffffff",
                fontSize: 8
              },
              emphasis: {
                show: false
              }
            },
            data: data,
            roam: true,
            itemStyle: {
              normal: {
                areaColor: "#0d0059",
                borderColor: "#389dff",
                borderWidth: 0.5
              },
              emphasis: {
                areaColor: "#17008d",
                areaColor: this.inRange[1],
                shadowOffsetX: 0,
                shadowOffsetY: 0,
                shadowBlur: 5,
                borderWidth: 0,
                shadowColor: "rgba(0, 0, 0, 0.5)"
              }
            }
          }
        ]
      };

      option && this.myChart.setOption(option);

      window.addEventListener("resize", this.resizeFn, true);
    },
    resizeFn() {
      this.myChart.resize();
    }
  }
};
</script>

<style lang="scss" scoped>
#emap {
  width: 100%;
  height: 100%;
}
</style>

父组件引入传参就可以实现