• 主要用到了better-xlsx和file-saver两个库

import { File } from 'better-xlsx';
import { saveAs } from 'file-saver';

function ExportExcel(column, dataSource, fileName = 'example') {
  // 新建工作谱
  const file = new File();
  // 新建表
  let sheet = file.addSheet('sheet-test');
  // 获取表头行数
  let depth = getDepth(column);
  // 获取表头的列数
  let columnNum = getColumns(column);
  // 新建表头行数
  let rowArr = [];
  for (let k = 0; k < depth; k++) {
    rowArr.push(sheet.addRow());
  }
  // 根据列数填充单元格
  rowArr.map(ele => {
    for (let j = 0; j < columnNum; j++) {
      let cell = ele.addCell();
      cell.value = j;
    }
  });
  // 初始化表头
  init(column, 0, 0);
  // 按顺序展平column
  let columnLineArr = [];
  columnLine(column);
  // 根据column,将dataSource里面的数据排序，并且转化为二维数组
  let dataSourceArr = [];
  dataSource.map(ele => {
    let dataTemp = [];
    columnLineArr.map(item => {
      dataTemp.push({
        [item.dataIndex]: ele[item.dataIndex],
        value: ele[item.dataIndex],
      });
    });
    dataSourceArr.push(dataTemp);
  });
  // debugger;
  // 绘画表格数据
  dataSourceArr.forEach((item, index) => {
    //根据数据,创建对应个数的行
    let row = sheet.addRow();
    row.setHeightCM(0.8);
    //创建对应个数的单元格
    item.map(ele => {
      let cell = row.addCell();
      if (ele.hasOwnProperty('num')) {
        cell.value = index + 1;
      } else {
        cell.value = ele.value;
      }
      cell.style.align.v = 'center';
      cell.style.align.h = 'center';
    });
  });
  //设置每列的宽度
  for (var i = 0; i < 4; i++) {
    sheet.col(i).width = 20;
  }
  file.saveAs('blob').then(function(content) {
    saveAs(content, fileName + '.xlsx');
  });

  // 按顺序展平column
  function columnLine(column) {
    column.map(ele => {
      if (ele.children === undefined || ele.children.length === 0) {
        columnLineArr.push(ele);
      } else {
        columnLine(ele.children);
      }
    });
  }
  // 初始化表头
  function init(column, rowIndex, columnIndex) {
    column.map((item, index) => {
      let hCell = sheet.cell(rowIndex, columnIndex);
      // 如果没有子元素, 撑满列
      if (item.title === '操作') {
        hCell.value = '';
        return;
      } else if (item.children === undefined || item.children.length === 0) {
        // 第一行加一个单元格
        hCell.value = item.title;
        hCell.vMerge = depth - rowIndex - 1;
        hCell.style.align.h = 'center';
        hCell.style.align.v = 'center';
        columnIndex++;
        // rowIndex++
      } else {
        let childrenNum = 0;
        function getColumns(arr) {
          arr.map(ele => {
            if (ele.children) {
              getColumns(ele.children);
            } else {
              childrenNum++;
            }
          });
        }
        getColumns(item.children);
        hCell.hMerge = childrenNum - 1;
        hCell.value = item.title;
        hCell.style.align.h = 'center';
        hCell.style.align.v = 'center';
        let rowCopy = rowIndex;
        rowCopy++;
        init(item.children, rowCopy, columnIndex);
        // 下次单元格起点
        columnIndex = columnIndex + childrenNum;
      }
    });
  }
  // 获取表头rows
  function getDepth(arr) {
    const eleDepths = [];
    arr.forEach(ele => {
      let depth = 0;
      if (Array.isArray(ele.children)) {
        depth = getDepth(ele.children);
      }
      eleDepths.push(depth);
    });
    return 1 + max(eleDepths);
  }

  function max(arr) {
    return arr.reduce((accu, curr) => {
      if (curr > accu) return curr;
      return accu;
    });
  }
  // 计算表头列数
  function getColumns(arr) {
    let columnNum = 0;
    arr.map(ele => {
      if (ele.children) {
        getColumns(ele.children);
      } else {
        columnNum++;
      }
    });
    return columnNum;
  }
}

export default ExportExcel;

• 引入文件，只要传入表头字段和表格数据即可。

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陈晓拉尼 个人博客