通过循环生成多个echarts图表并实现自适应

不推荐使用grid布局，不清楚为什么左边一列的不会自适应，换成flex布局就可以了

主要方法借助中的getInstanceByDom方法

完整代码：

<template>
  <div class="statis">
    <div class="content" >
      <!-- v-for 遍历父级div-->
      <div class="main" v-for="(item,index) in echartsData" :key="index">
        <!--自定义宽高的dom，用于放置图表-->
        <div class="bar"></div>
        <img class="title-bg" src="@/assets/img/title-bg.png"/>
      </div>
    </div>
  </div>
</template>
<script>
import elementResizeDetectorMaker from "element-resize-detector";
 
  export default {
    name: "test",
    data() {
      return {
        observer: null,
        titleIcon:require('@/assets/img/title-bg.png'),
        echartsData: [
           {
            title:'标题1换个环境官方',
              data: [
                { value: 20,  name: '数据1' },
                { value: 300, name: '数据2' },
                { value: 300, name: '数据3' }
              ],
           },
            {
            title:'环境官方',
              data: [
                { value: 20,  name: '数据1' },
                { value: 300, name: '数据2' }
              ],
           },
            {
            title:'官方',
              data: [
                { value: 20,  name: '数据1'},
                { value: 300, name: '数据2'}
              ],
           },
            {
            title:'标题1换个环境官方',
              data: [
                { value: 20, name: '数据1'},
                { value: 300, name: '公共 部分' }
              ],
           }
        ],
        color: ['#5B8FF9', '#ca2df5', '#42CE92', '#f96950', '#047ff5'],//颜色列表
      }
    },
    methods: {
      // 方法：绘制柱状图
      drawBar() {
        var myEchart = document.getElementsByClassName('bar'); //获取类名
        //此处for循环多次初始化 echarts 实例
        for (var i = 0; i <  myEchart.length; i++) {
        var myChart = this.$echarts.init(myEchart[i]) //初始化echarts实例要在for循环内
          if(myChart){
            let option = {
              title: {
                text: this.echartsData[i].title,
                left: 40,
                top:'20',
                textStyle: {
                    color:'#383838',
                    fontSize: 16,   
                  }
              },
              tooltip: {
                trigger: 'item'
              },
              legend: {
                top: '50',
                left: 'center'
              },
              series: [
                {
                type: 'pie',
                radius: ['40%', '55%'],
                  center: ['50%', '60%'], // 调整饼图位置
                  data: this.echartsData[i].data,
              itemStyle:{
                    normal:{
                            label:{
                                    show: true,
                                    formatter: '{b} : {c} ({d}%)'
                                  },
                            labelLine :{show:true},
                            color: function (colors) {
                    var colorList = [
                                '#73DEB3',
                                '#578EF8',
                                '#9A60B4',
                                '#ef6567',
                                '#f9c956',
                                '#3BA272'
                              ];
                    return colorList[colors.dataIndex];
                  }
                }
              }
            }] 
          }
          //使用刚指定的配置项和数据显示图表
          myChart.setOption(option)
          // window.addEventListener("resize", () => {
          //     myChart.resize();
          // })
            
          }
      //      const echartAll = document.getElementsByClassName('bar')
      // window.onresize = function() {
      //   for (let i = 0; i < echartAll.length; i++) {
      //     var myChart = this.$echarts.init(echartAll[i])
      //     myChart.resize()
      //   }
      // }
        }
      },
 
      // 处理多个图形的自适应
      getEchartObj() {
          var  myEchart = document.getElementsByClassName('bar'); //获取类名
           for (var i = 0; i <  myEchart.length; i++){
              console.log('myEchart[i]',myEchart[i]);
               let  _ref= myEchart[i];//遍历生成的折线图的Dom
               let myEchars = _ref?this.$echarts.getInstanceByDom(_ref):undefined;
               if(myEchars!== undefined){
                  myEchars.resize();
               }
           }
      },
    
    },
    mounted() {
      //调用绘制柱状图的方法
      this.$nextTick(()=>{
        this.drawBar()
      
      })
 
       this.$nextTick(()=>{
        window.onresize = ()=>{
          this.getEchartObj()
        }
    })
 
    }
  }
</script>
 
<style scoped>
  .content {
    display: flex;
    /* grid-template-columns: 1fr 1fr 1fr; */
    gap: 20px;
    flex-wrap: wrap;
  }
 
  .main {
    width:calc((100% - 46px)/3);
    border: 1px solid #D0D0D0;
    height: 360px;
    background-color: #FFFFFF;
    position: relative;
  }
  .title-bg{
    position:absolute;
    top:23px;
    left:20px;
  }
  .main .bar {
    width: 100%;
    height: 100%;
  }
</style>