如何使用JavaScript实现前端导入和导出excel文件(H5编辑器实战复盘)

// 解析并提取excel数据
let reader = new FileReader();
reader.onload = function(e) {
  let data = e.target.result;
  let workbook = XLSX.read(data, {type: 'binary'});
  let sheetNames = workbook.SheetNames; // 工作表名称集合
  let draftObj = {}
  sheetNames.forEach(name => {
    // 通过工作表名称来获取指定工作表
    let worksheet = workbook.Sheets[name]; 
    for(let key in worksheet) {
      // v是读取单元格的原始值
      if(key[0] !== '!') {
        if(draftObj[key[0]]) {
          draftObj[key[0]].push(worksheet[key].v)
        }else {
          draftObj[key[0]] = [worksheet[key].v]
        }
      }
    }
  });
  // 生成ant-table支持的数据格式
  let sourceData = Object.values(draftObj).map((item,i) => ({ key: i + '', name: item[0], value: item[1]}))
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const data = [
  { genre: 'Sports', sold: 275 },
  { genre: 'Strategy', sold: 115 },
  { genre: 'Action', sold: 120 },
  { genre: 'Shooter', sold: 350 },
  { genre: 'Other', sold: 150 }
];
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import { Chart } from '@antv/f2';
import React, { memo, useEffect, useRef } from 'react';
import ChartImg from '@/assets/chart.png';

import styles from './index.less';
import { IChartConfig } from './schema';

interface XChartProps extends IChartConfig {
  isTpl: boolean;
}

const XChart = (props: XChartProps) => {
  const { isTpl, data, color, size, paddingTop, title } = props;
  const chartRef = useRef(null);
  useEffect(() => {
    if (!isTpl) {
      const chart = new Chart({
        el: chartRef.current || undefined,
        pixelRatio: window.devicePixelRatio, // 指定分辨率
      });

      // step 2: 处理数据
      const dataX = data.map(item => ({ ...item, value: Number(item.value) }));

      // Step 2: 载入数据源
      chart.source(dataX);

      // Step 3：创建图形语法，绘制柱状图，由 genre 和 sold 两个属性决定图形位置，genre 映射至 x 轴，sold 映射至 y 轴
      chart
        .interval()
        .position('name*value')
        .color('name');

      // Step 4: 渲染图表
      chart.render();
    }
  }, [data, isTpl]);
  return (
    <div className={styles.chartWrap}>
      <div className={styles.chartTitle} style={{ color, fontSize: size, paddingTop }}>
        {title}
      </div>
      {isTpl ? <img src={ChartImg} alt="dooring chart" /> : <canvas ref={chartRef}></canvas>}
    </div>
  );
};

export default memo(XChart);
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const generateExcel = () => {
    let option = {};  //option代表的就是excel文件
    let dataTable = [];  //excel文件中的数据内容
    let len = list.length;
    if (len) {
        for(let i=0; i<len; i++) {
            let row = list[i];
            let obj:any = {};
            for(let key in row) {
                if(typeof row[key] === 'object') {
                    let arr = row[key];
                    obj[key] = arr.map((item:any) => (typeof item === 'object' ? item.label : item)).join(',')
                }else {
                    obj[key] = row[key]
                }
            }
            dataTable.push(obj);  //设置excel中每列所获取的数据源
        }
    }
    let tableKeys = Object.keys(dataTable[0]);
    option.fileName = tableName;  //excel文件名称
    option.datas = [
          {
            sheetData: dataTable,  //excel文件中的数据源
            sheetName: tableName,  //excel文件中sheet页名称
            sheetFilter: tableKeys,  //excel文件中需显示的列数据
            sheetHeader: tableKeys,  //excel文件中每列的表头名称
          }
    ]
    let toExcel = new ExportJsonExcel(option);  //生成excel文件
    toExcel.saveExcel();  //下载excel文件
  }
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