Vue および ECharts4Taro3 上級ガイド: ビッグ データ視覚化のパフォーマンス最適化を実現する方法

<template>
  <div>
    <div v-for="item in visibleData" :key="item.id">{{item.value}}</div>
    <div ref="scroll" @scroll="loadMoreData"></div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      data: [], // 所有数据
      visibleData: [], // 可见数据
      pageNum: 1, // 当前页码
      pageSize: 10, // 每页显示数量
    };
  },
  mounted() {
    this.loadData();
  },
  methods: {
    async loadData() {
      const res = await api.fetchData(this.pageNum, this.pageSize); // 请求接口获取数据
      this.data = res.data;
      this.updateVisibleData();
    },
    updateVisibleData() {
      const start = (this.pageNum - 1) * this.pageSize;
      const end = this.pageNum * this.pageSize;
      this.visibleData = this.data.slice(start, end);
    },
    async loadMoreData() {
      const { scrollTop, clientHeight, scrollHeight } = this.$refs.scroll;
      if (scrollTop + clientHeight >= scrollHeight) {
        this.pageNum++;
        await this.loadData();
      }
    },
  },
};
</script>

const processedDataCache = {};

function processData(data) {
  if (processedDataCache[data]) {
    return processedDataCache[data];
  }
  // 数据处理逻辑
  const processedData = /* 进行数据处理 */;
  processedDataCache[data] = processedData;
  return processedData;
}

import MyWorker from 'worker-loader!./my-worker'; // 加载Web Worker文件

const worker = new MyWorker();

worker.onmessage = (event) => {
  console.log('Received message from worker:', event.data);
};

worker.postMessage('Start calculation'); // 向Web Worker发送消息

const canvas = document.getElementById('myCanvas');
const context = canvas.getContext('2d');

// 绘制图形
context.beginPath();
context.moveTo(20, 20);
context.lineTo(100, 100);
context.stroke();

import { throttle, debounce } from 'lodash';

// 节流函数
function throttledFn() {
  // 处理函数逻辑
}

const throttled = throttle(throttledFn, 1000); // 控制1秒内只能执行一次

// 防抖函数
function debouncedFn() {
  // 处理函数逻辑
}

const debounced = debounce(debouncedFn, 1000); // 只有在1秒内没有再次触发时才会执行