【在前端不用接口直接导出.xlsx文件】

一：
注意：ref=“table”

          <el-button type="primary" icon="el-icon-download" @click="exportExcel">导出Excel</el-button>

         <el-table :data="codeData" border ref="table">
            <el-table-column label="数据实体" prop="dataName" align="center"/>
            <el-table-column label="更新时间" prop="updateTime" align="center"/>
          </el-table>

二：引入方法：

import { deleteCol } from '@/utils/excel'

三：methods:

    exportExcel() {
      const workbook = this.$xlsx.utils.table_to_book(this.$refs.table.$el, { raw: true })
      deleteCol(workbook.Sheets[workbook.SheetNames[0]], 8)
      return this.$xlsx.writeFile(workbook, 'download.xlsx')
    },

四：引入的文件内容：
/utils/excel

import * as xlsx from 'xlsx'

function encodeCell(r, c) {
  return xlsx.utils.encode_cell({ r, c })
}

export function deleteRow(ws, index) {
  const range = xlsx.utils.decode_range(ws['!ref'])
  for (let row = index; row < range.e.r; row++) {
    for (let col = range.s.c; col <= range.e.c; col++) {
      ws[encodeCell(row, col)] = ws[encodeCell(row + 1, col)]
    }
  }
  range.e.r--
  ws['!ref'] = xlsx.utils.encode_range(range.s, range.e)
}

export function deleteCol(ws, index) {
  const range = xlsx.utils.decode_range(ws['!ref'])
  for (let col = index; col < range.e.c; col++) {
    for (let row = range.s.r; row <= range.e.r; row++) {
      ws[encodeCell(row, col)] = ws[encodeCell(row, col + 1)]
    }
  }
  range.e.c--
  ws['!ref'] = xlsx.utils.encode_range(range.s, range.e)
}

export function exportExcelFile(array, sheetName = '表1', fileName = 'example.xlsx') {
  let jsonWorkSheet = xlsx.utils.json_to_sheet(array)
  let workBook = xlsx.utils.book_new()
  workBook = {
    SheetNames: [sheetName],
    Sheets: {
      [sheetName]: jsonWorkSheet,
    },
  }
  return xlsx.writeFile(workBook, fileName)
}