在vue3中

   <template>
      <div id="main" style="height: 500px;width: 500px;"></div>
    </template>
    
    <script setup>
    import * as echarts from 'echarts';
    import { onMounted,onUnmounted } from 'vue';
    onMounted(() => {
      initChart();
    });
    
    onUnmounted(() => {
      myChart.dispose();// 调用dispose方法释放echarts实例
    });
    // 基于准备好的dom，初始化echarts实例
    const initChart = () => {
      let myChart = echarts.init(document.getElementById('main'));
    // 绘制图表
    myChart.setOption({
      title: {
        text: 'ECharts 入门示例'
      },
      tooltip: {},
      xAxis: {
        data: ['衬衫', '羊毛衫', '雪纺衫', '裤子', '高跟鞋', '袜子']
      },
      yAxis: {},
      series: [
        {
          name: '销量',
          type: 'bar',
          data: [5, 20, 36, 10, 10, 20]
        }
      ]
    });
    }
    </script>

注意：Echarts必须在DOM节点加载后才能渲染，也就是必须在onMounted中调用
官网：https://echarts.apache.org/zh/index.html