如何在Vue和ECharts4Taro3中实现大规模数据的快速渲染和交互

<template>
  <div>
    <div id="chart"></div>
    <div id="scroll" style="height: 400px; overflow-y: auto" @scroll="handleScroll">
      <div v-for="item in visibleData" :key="item.id">{{ item.value }}</div>
    </div>
  </div>
</template>

<script>
import { ref, reactive, onMounted } from 'vue';
import * as echarts from 'echarts';
import { useVirtual } from 'vue-virtual-scroll';

export default {
  setup() {
    const data = reactive({
      dataset: [...], // 原始的大规模数据集
      start: 0, // 当前渲染的起始位置
      end: 100, // 当前渲染的结束位置
    });

    const scrollContainer = ref(null);
    const { items, totalHeight } = useVirtual({
      containerRef: scrollContainer,
      estimateSize: 20, // 每个数据项的高度
      bufferSize: 4, // 预加载的数据项数量
      dataInfo: {
        size: data.dataset.length,
      },
    });

    const visibleData = ref([]);

    const handleScroll = () => {
      const scrollTop = scrollContainer.value.scrollTop;
      const start = Math.floor(scrollTop / 20); // 计算当前可视区域的起始位置
      const end = Math.min(start + 100, data.dataset.length); // 计算当前可视区域的结束位置

      visibleData.value = data.dataset.slice(start, end);
    };

    onMounted(() => {
      const chart = echarts.init(document.getElementById('chart'));

      // 渲染图表
      chart.setOption({...});

      handleScroll();
    });

    return {
      visibleData,
      scrollContainer,
      totalHeight,
    };
  },
};
</script>

// 省略部分模板代码和样式代码

<script>
export default {
  props: {
    dataset: {
      type: Array,
      required: true,
    },
  },
  data() {
    return {
      chart: null,
      aggregationLevel: 1, // 数据聚合的级别
      delayRender: false, // 是否延迟渲染数据
    };
  },
  watch: {
    dataset: {
      handler() {
        if (this.delayRender) {
          this.throttleRender();
        } else {
          this.renderChart();
        }
      },
      immediate: true,
    },
  },
  methods: {
    renderChart() {
      // 渲染图表
      const chartDataset = this.dataset.reduce((result, item, index) => {
        if (index % this.aggregationLevel === 0) {
          result.push(item);
        }
        return result;
      }, []);

      this.chart.setOption({...});
    },
    throttleRender: _.throttle(function () {
      this.renderChart();
    }, 500),
  },
  mounted() {
    this.chart = echarts.init(this.$refs.chart);
  },
};
</script>