一、安装依赖

npm i -S file-saver
npm i -S xlsx

二、在src目录下新建excel文件夹，新建json2excel.js，并引入依赖

import { saveAs } from 'file-saver'
import XLSX from 'xlsx/dist/xlsx.full.min'

三、json2excel.js

将json数据处理为xlsx需要的格式

function datenum(v, date1904) {
    if (date1904) v += 1462
    let epoch = Date.parse(v)
    return (epoch - new Date(Date.UTC(1899, 11, 30))) / (24 * 60 * 60 * 1000)
}

function data2ws(data) {
    const ws = {}
    const range = {s: {c: 10000000, r: 10000000}, e: {c: 0, r: 0}}
    for (let R = 0; R != data.length; ++R) {
        for (let C = 0; C != data[R].length; ++C) {
            if (range.s.r > R) range.s.r = R
            if (range.s.c > C) range.s.c = C
            if (range.e.r < R) range.e.r = R
            if (range.e.c < C) range.e.c = C
            const cell = { v: data[R][C] }
            if (cell.v == null) continue
            const cell_ref = XLSX.utils.encode_cell({c: C, r: R})

            if (typeof cell.v === 'number') cell.t = 'n'
            else if (typeof cell.v === 'boolean') cell.t = 'b'
            else if (cell.v instanceof Date) {
                cell.t = 'n'
                cell.z = XLSX.SSF._table[14]
                cell.v = datenum(cell.v)
            }
            else cell.t = 's'

            ws[cell_ref] = cell
        }
    }
    if (range.s.c < 10000000) ws['!ref'] = XLSX.utils.encode_range(range)
    return ws
}

导出excel

function Workbook() {
    if (!(this instanceof Workbook)) return new Workbook()
    this.SheetNames = []
    this.Sheets = {}
}

function s2ab(s) {
    const buf = new ArrayBuffer(s.length)
    const view = new Uint8Array(buf)
    for (let i = 0; i != s.length; ++i) view[i] = s.charCodeAt(i) & 0xFF
    return buf
}

/*
* th => 表头
* data => 数据
* fileName => 文件名
* fileType => 文件类型
* sheetName => sheet页名
*/
export default function toExcel ({th, data, fileName, fileType, sheetName}) {
    data.unshift(th)
    const wb = new Workbook(), ws = data2ws(data)
    sheetName = sheetName || 'sheet1'
    wb.SheetNames.push(sheetName)
    wb.Sheets[sheetName] = ws
    fileType = fileType || 'xlsx'
    var wbout = XLSX.write(wb, {bookType: fileType, bookSST: false, type: 'binary'})
    fileName = fileName || '列表'
    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), `${fileName}.${fileType}`)
}

四、在main.js中全局挂载toExcel方法

import toExcel from '@/excel/json2excel'

Vue.prototype.$toExcel = toExcel

五、在组件中调用toExcel方法导出excel

data() {
    return {
      excelData: [
        {
          name: '张三',
          birthday: new Date('1990-01-01'),
          sex: '男',
          age: 28
        },
        {
          name: '李四',
          birthday: new Date('1991-01-01'),
          sex: '女',
          age: 27
        }
      ]
    }
  },
  methods: {
    downExcel() {
      const th = ['姓名', '生日', '性别', '年龄']
      const filterVal = ['name', 'birthday', 'sex', 'age']
      const data = this.excelData.map(v => filterVal.map(k => v[k]))
      const [fileName, fileType, sheetName] = ['测试下载', 'xlsx', '测试页']
      this.$toExcel({th, data, fileName, fileType, sheetName})
    }
  }

六、导出成功