首先，安装三个依赖包：

npm install -S file-saver（生产依赖，则为-s）

npm install -S xlsx

npm install -D script-loader （开发依赖，则为-d）

我们在src目录下新建一个文件夹，例如vendor，然后把：Blob.js和 Export2Excel.js两个文件（可以去网上找这两个文件）放在该文件夹下，在Export2Excel.js文件中我们引入：

/* eslint-disable */
require('script-loader!file-saver'); // 保存文件
require('script-loader!@/vendor/Blob'); // 转二进制
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='excel-list', autoWidth=true}={}) {
    /* original data */
    data=[...data]
    data.unshift(header);
    var ws_name = "SheetJS";
    var wb = new Workbook(), ws = sheet_from_array_of_arrays(data);

    if(autoWidth){
      /*设置worksheet每列的最大宽度*/
      const colWidth = data.map(row => row.map(val => {
        /*先判断是否为null/undefined*/
        if (val == null) {
          return {'wch': 10};
        }
        /*再判断是否为中文*/
        else if (val.toString().charCodeAt(0) > 255) {
          return {'wch': val.toString().length * 2};
        } else {
          return {'wch': val.toString().length};
        }
      }))
      /*以第一行为初始值*/
      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: 'xlsx', bookSST: false, type: 'binary'});
    saveAs(new Blob([s2ab(wbout)], {type: "application/octet-stream"}), filename + ".xlsx");
}

导出按钮：

<template>
  <el-button type="primary" @click="handleDownload" :loading="downloadLoading" icon="el-icon-download">导出</el-button>
</template>

methods：

 // 导出excel数据
    handleDownload() {
      if (this.total > 0) {
        this.$confirm('确定将此数据导出Excel文件?', '提示', {
          confirmButtonText: '确定',
          cancelButtonText: '取消',
          type: 'warning'
        }).then(() => {
          this.downloadLoading = true
          import('@/vendor/Export2Excel').then(excel => {
            const tHeader = ['集中器名称', '集中器地址', '数据保存时间', '电脑保存时间', '正相有功电能量', '总功率', '总功率因素', 'A相电压', 'B相电压', 'C相电压', 'A相电流', 'B相电流', 'C相电流', 'A相功率', 'B相功率', 'C相功率', 'A相功率因素', 'B相功率因素', 'C相功率因素'] // 表头
            const filterVal = ['terminalName', 'terminal', 'datatime', 'computertime', 'foract', 'actpow', 'cos', 'avol', 'bvol', 'cvol', 'acul', 'bcul', 'ccul', 'aactpow', 'bactPow', 'cactPow', 'aCos', 'bCos', 'ccos'] // 需要导出的项目
            const list = this.listData // 所有列表数据
            const data = this.formatJson(filterVal, list)
            excel.export_json_to_excel({
              header: tHeader,
              data,
              autoWidth: this.autoWidth,
              filename: 'terminalState_list' // 文件名称
            })
            this.downloadLoading = false
          })
        }).catch(() => {
          this.$message({
            type: 'info',
            message: '已取消导出'
          })
        })
      } else {
        this.$message('暂无数据可导出')
      }
    },
    // 过滤需要的数据
    formatJson(filterVal, jsonData) {
      return jsonData.map(v => filterVal.map(j => {
        if (j === 'timestamp') {
          return parseTime(v[j])
        } else {
          return v[j]
        }
      }))
    },
parseTime(time, cFormat) {
  if (arguments.length === 0) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if (('' + time).length === 10) time = parseInt(time) * 1000
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{(y|m|d|h|i|s|a)+}/g, (result, key) => {
    let value = formatObj[key]
    if (key === 'a') return ['一', '二', '三', '四', '五', '六', '日'][value - 1]
    if (result.length > 0 && value < 10) {
      value = '0' + value
    }
    return value || 0
  })
  return time_str
}

注意：导出方法里面的excel名称一定要使用自己的命名的名称，否则会出错