1.安装 xlsx 库

npm install xlsx

2.创建导出函数

src/utils/excelUtils.js

import * as XLSX from 'xlsx';

const exportToExcel = (fileName, datas, sheetNames) => {
   // 创建工作簿
   const wb = XLSX.utils.book_new()
   for (let i = 0; i < datas.length; i++) {
        let data = datas[i];
        let sheetName = sheetNames[i];
        // 创建工作表
        let ws = XLSX.utils.json_to_sheet(data)
        // 将工作表放入工作簿中
        XLSX.utils.book_append_sheet(wb, ws, sheetName)
    }
   // 生成文件并下载
   XLSX.writeFile(wb, fileName)
}

export default exportToExcel;

3.在组件中调用导出函数

<template>
    <div>
      <el-button  @click="exportExcel">导出 Excel</el-button>
    </div>
  </template>
  
  <script lang="ts">
  import  exportToExcel  from '@/utils/excelUtils';

  const exportExcel = () => {
  const data2 = [
    { name: 'Alice', age: 25, occupation: 'Engineer' },
    { name: 'Bob', age: 30, occupation: 'Designer' },
    { name: 'Carol', age: 28, occupation: 'Developer' }
  ];

  const data3 = [
    { name2: 'Alice', age: 27, occupation: 'Engineer' },
    { name2: 'Bob', age: 31, occupation: 'Designer' },
    { name2: 'Carol', age: 29, occupation: 'Developer' }
  ];

  exportToExcel('user_data.xlsx', [data2, data3], ['Sheet1', 'Sheet_data3']);
};

export default {
  methods: {
    exportExcel
  }
};
  </script>

4.补充： 列名替换成中文

<template>
    <div>
      <el-button  @click="exportExcel">导出 Excel</el-button>
    </div>
  </template>
  
  <script lang="ts">
  import  exportToExcel  from '@/utils/excelUtils';

  const exportExcel = () => {
  const data2 = [
    { name: 'Alice', age: 25, occupation: 'Engineer' },
    { name: 'Bob', age: 30, occupation: 'Designer' },
    { name: 'Carol', age: 28, occupation: 'Developer' }
  ];

  const data3 = [
    { name2: 'Alice', age: 27, occupation: 'Engineer' },
    { name2: 'Bob', age: 31, occupation: 'Designer' },
    { name2: 'Carol', age: 29, occupation: 'Developer' }
  ];

  const changeFieldName = { // 替换列名的对应关系
    name: '名称',
    name2: '名称2',
    age: "年龄",
    occupation: "职业"
  }

  let dealcolumn = function (dataIn, fieldNameMap) { // 替换写表的列名
    dataIn.forEach((item) => {
      for (const field in fieldNameMap) {
        const value = fieldNameMap[field];
        if (item[field] != null) {
          item[value] = item[field]
          delete item[field];
        }
      }
    })
  };

  dealcolumn(data2, changeFieldName);
  dealcolumn(data3, changeFieldName);

  exportToExcel('user_data.xlsx', [data2, data3], ['Sheet1', 'Sheet_data3']);
};

export default {
  methods: {
    exportExcel
  }
};
  </script>