excel.js

import * as XLSX from 'xlsx';

function autoWidthFunc(ws, data) {
  const colWidth = data.map((row) =>
    row.map((val) => {
      var reg = new RegExp('[\\u4E00-\\u9FFF]+', 'g'); //检测字符串是否包含汉字
      if (val === null) {
        return { wch: 10 };
      } else if (reg.test(val)) {
        return { wch: val.toString().length * 2 };
      }
      return { wch: val.toString().length };
    })
  );
  // start in the first row
  const result = colWidth[0];
  for (let i = 1; i < colWidth.length; i++) {
    for (let j = 0; j < colWidth[i].length; j++) {
      if (result[j].wch < colWidth[i][j].wch) {
        result[j].wch = colWidth[i][j].wch;
      }
    }
  }
  ws['!cols'] = result;
}

function jsonToArray(key, jsonData) {
  return jsonData.map((v) =>
    key.map((j) => {
      return v[j];
    })
  );
}

const exportArrayToExcel = ({ key, data, title, filename, autoWidth }) => {
  const wb = XLSX.utils.book_new();
  const arr = jsonToArray(key, data);
  arr.unshift(title);
  const ws = XLSX.utils.aoa_to_sheet(arr);
  if (autoWidth) {
    autoWidthFunc(ws, arr);
  }
  XLSX.utils.book_append_sheet(wb, ws, filename);
  XLSX.writeFile(wb, filename + '.xlsx');
};

export default {
  exportArrayToExcel,
};

引用

import excel from '@/utils/downloadExcel.js';
// 导出
    exportExcel() {
      const params = {
        title: ['名字', '数量'],
        key: ['name', 'count'],
        data: this.groupItemList[0].children, // 数据源
        autoWidth: true, //autoWidth等于true，那么列的宽度会适应那一列最长的值
        filename: this.groupItemList[0].title,
      };
      excel.exportArrayToExcel(params);
    },