Vue フレームワークで統計グラフのレンダリング パフォーマンスを最適化する方法

import { debounce } from 'lodash'

export default {
  data() {
    return {
      chartData: [],  // 统计图表数据
      debouncedUpdateChart: null  // 防抖函数
    }
  },
  created() {
    this.debouncedUpdateChart = debounce(this.updateChart, 200)  // 设置防抖函数
  },
  methods: {
    updateChartData() {
      // 更新统计图表数据
      // ...
      this.debouncedUpdateChart()
    },
    updateChart() {
      // 绘制图表
      // ...
    }
  }
}

<template>
  <div class="chart-container" ref="container">
    <div ref="content">
      <ChartItem v-for="item in visibleData" :key="item.id" :data="item" />
    </div>
  </div>
</template>

<script>
import ChartItem from './ChartItem.vue'
import { throttle } from 'lodash'

export default {
  components: {
    ChartItem
  },
  data() {
    return {
      data: [],  // 总数据
      visibleData: [],  // 可见数据
      containerHeight: 0,  // 容器高度
      contentHeight: 0,  // 内容高度
      scrollHeight: 0,  // 滚动高度
      visibleRange: {  // 可见范围
        start: 0,
        end: 0
      },
      throttledUpdateVisibleData: null  // 节流函数
    }
  },
  mounted() {
    this.calculateHeight()
    this.throttledUpdateVisibleData = throttle(this.updateVisibleData, 200)  // 设置节流函数

    this.$refs.container.addEventListener('scroll', this.onScroll)  // 监听滚动事件
  },
  destroyed() {
    this.$refs.container.removeEventListener('scroll', this.onScroll)  // 移除滚动事件监听
  },
  methods: {
    calculateHeight() {
      const container = this.$refs.container
      const content = this.$refs.content
      
      this.containerHeight = container.clientHeight
      this.contentHeight = content.clientHeight
      this.scrollHeight = this.contentHeight - this.containerHeight
    },
    updateVisibleData() {
      const scrollTop = this.$refs.container.scrollTop
      const start = Math.floor(scrollTop / ITEM_HEIGHT)
      const end = Math.min(start + VISIBLE_ITEMS, this.data.length)

      this.visibleRange = { start, end }
      this.visibleData = this.data.slice(start, end)
    },
    onScroll() {
      this.throttledUpdateVisibleData()
    }
  }
}
</script>

<template>
  <canvas ref="canvas"></canvas>
</template>

<script>
import Chart from 'chart.js'

export default {
  mounted() {
    const canvas = this.$refs.canvas

    new Chart(canvas, {
      type: 'bar',
      data: {
        // 统计图表数据
      },
      options: {
        // 配置项
      }
    })
  }
}
</script>