バックエンドはデータを返してエクセル表をエクスポートします.

//   
    download() {
      this.downloadLoading = true
      this.initExcelCanteenDetail()
    },

 async initExcelCanteenDetail() {
     // if (!await this.beforeInitExcel()) {
      //  return
     // }
      return new Promise((resolve, reject) => {
        initData(this.url, this.params).then(res => {
          this.dataExcel = res.content
          import('@/utils/export2Excel').then(excel => {
            const tHeader = ['  ', '  ', '    ', '    ', '    ', '  ', '  ', '  ']
            const filterVal = ['workName', 'workNO', 'parkName', 'department', 'nextDep', 'jobLevel', 'type', 'pushTime']
            console.log('dataExcel:', this.dataExcel)
            const data = this.formatJson(filterVal, this.dataExcel)
            excel.export_json_to_excel({
              header: tHeader,
              data,
              filename: '    '
            })
            this.downloadLoading = false
          })
          resolve(res)
        }).catch(err => {
          reject(err)
        })
      })
    },
    //     
    formatJson(filterVal, jsonData) {
      return jsonData.map(v => filterVal.map(j => {
        if (j === 'pushTime' || j === 'lastPasswordResetTime') {
          return parseTime(v[j])
        } else if (j === 'enabled') {
          return parseTime(v[j]) ? '  ' : '  '
        } else {
          return v[j]
        }
      }))
    },

/* eslint-disable */
require('script-loader!file-saver');
import XLSX from 'xlsx'

function generateArray(table) {
  var out = [];
  var rows = table.querySelectorAll('tr');
  var ranges = [];
  for (var R = 0; R < rows.length; ++R) {
    var outRow = [];
    var row = rows[R];
    var columns = row.querySelectorAll('td');
    for (var C = 0; C < columns.length; ++C) {
      var cell = columns[C];
      var colspan = cell.getAttribute('colspan');
      var rowspan = cell.getAttribute('rowspan');
      var cellValue = cell.innerText;
      if (cellValue !== "" && cellValue == +cellValue) cellValue = +cellValue;

      //Skip ranges
      ranges.forEach(function (range) {
        if (R >= range.s.r && R <= range.e.r && outRow.length >= range.s.c && outRow.length <= range.e.c) {
          for (var i = 0; i <= range.e.c - range.s.c; ++i) outRow.push(null);
        }
      });

      //Handle Row Span
      if (rowspan || colspan) {
        rowspan = rowspan || 1;
        colspan = colspan || 1;
        ranges.push({
          s: {
            r: R,
            c: outRow.length
          },
          e: {
            r: R + rowspan - 1,
            c: outRow.length + colspan - 1
          }
        });
      };

      //Handle Value
      outRow.push(cellValue !== "" ? cellValue : null);

      //Handle Colspan
      if (colspan)
        for (var k = 0; k < colspan - 1; ++k) outRow.push(null);
    }
    out.push(outRow);
  }
  return [out, ranges];
};

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

function sheet_from_array_of_arrays(data, opts) {
  var ws = {};
  var range = {
    s: {
      c: 10000000,
      r: 10000000
    },
    e: {
      c: 0,
      r: 0
    }
  };
  for (var R = 0; R != data.length; ++R) {
    for (var 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;
      var cell = {
        v: data[R][C]
      };
      if (cell.v == null) continue;
      var 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;
}

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

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

export function export_table_to_excel(id) {
  var theTable = document.getElementById(id);
  var oo = generateArray(theTable);
  var ranges = oo[1];

  /* original data */
  var data = oo[0];
  var ws_name = "SheetJS";

  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  /* add ranges to worksheet */
  // ws['!cols'] = ['apple', 'banan'];
  ws['!merges'] = ranges;

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX.write(wb, {
    bookType: 'xlsx',
    bookSST: false,
    type: 'binary'
  });

  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), "test.xlsx")
}

export function export_json_to_excel({
  header,
  data,
  filename,
  autoWidth = true,
  bookType=  'xlsx'
} = {}) {
  /* original data */
  filename = filename || 'excel-list'
  data = [...data]
  data.unshift(header);
  var ws_name = "SheetJS";
  var wb = new Workbook(),
    ws = sheet_from_array_of_arrays(data);

  if (autoWidth) {
    /*  worksheet       */
    const colWidth = data.map(row => row.map(val => {
      /*      null/undefined*/
      if (val == null) {
        return {
          'wch': 10
        };
      }
      /*        */
      else if (val.toString().charCodeAt(0) > 255) {
        return {
          'wch': val.toString().length * 2
        };
      } else {
        return {
          'wch': val.toString().length
        };
      }
    }))
    /*        */
    let 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;
  }

  /* add worksheet to workbook */
  wb.SheetNames.push(ws_name);
  wb.Sheets[ws_name] = ws;

  var wbout = XLSX.write(wb, {
    bookType: bookType,
    bookSST: false,
    type: 'binary'
  });
  saveAs(new Blob([s2ab(wbout)], {
    type: "application/octet-stream"
  }), `${filename}.${bookType}`);
}

[
{workName:'100',workNO:'001',........................... },
]

import request from '@/utils/request'

export function initData(url, params) {
  return request({
    url: url,
    method: 'get',
    params
  })
}
export function initPostData(url, data) {
  return request({
    url: url,
    method: 'post',
    data
  })
}

import axios from 'axios'
import router from '@/router/routers'
import { Notification, MessageBox } from 'element-ui'
import store from '../store'
import { getToken } from '@/utils/auth'
import Config from '@/config'

//   axios  
const service = axios.create({
  baseURL: process.env.BASE_API, // api   base_url
  timeout: Config.timeout //       
})

// request   
service.interceptors.request.use(
  config => {
    if (getToken()) {
      config.headers['Authorization'] = 'Bearer ' + getToken() //           token            
    }
    config.headers['Content-Type'] = 'application/json'
    return config
  },
  error => {
    // Do something with request error
    console.log(error) // for debug
    Promise.reject(error)
  }
)

// response    
service.interceptors.response.use(
  response => {
    const code = response.status
    if (code < 200 || code > 300) {
      Notification.error({
        title: response.message
      })
      return Promise.reject('error')
    } else {
      return response.data
    }
  },
  error => {
    let code = 0
    try {
      code = error.response.data.status
    } catch (e) {
      if (error.toString().indexOf('Error: timeout') !== -1) {
        Notification.error({
          title: '      ',
          duration: 2500
        })
        return Promise.reject(error)
      }
      if (error.toString().indexOf('Error: Network Error') !== -1) {
        Notification.error({
          title: '      ',
          duration: 2500
        })
        return Promise.reject(error)
      }
    }
    if (code === 401) {
      MessageBox.confirm(
        '       ，          ，      ',
        '    ',
        {
          confirmButtonText: '    ',
          cancelButtonText: '  ',
          type: 'warning'
        }
      ).then(() => {
        store.dispatch('LogOut').then(() => {
          location.reload() //        vue-router     bug
        })
      })
    } else if (code === 403) {
      router.push({ path: '/401' })
    } else {
      const errorMsg = error.response.data.message
      if (errorMsg !== undefined) {
        Notification.error({
          title: errorMsg,
          duration: 2500
        })
      }
    }
    return Promise.reject(error)
  }
)
export default service