excel导入功能需要使用npm包xlsx，所以需要安装xlsx插件

npm install xlsx@0.16.9 // 注意版本过高可能无法使用

UploadExcel文件，有基本样式，可修改

<template>
  <div class="upload-excel">
    <div class="btn-upload">
      <el-button :loading="loading" size="mini" type="primary" @click="handleUpload">
        点击上传
      </el-button>
    </div>

    <input ref="excel-upload-input" class="excel-upload-input" type="file" accept=".xlsx, .xls" @change="handleClick">
    <div class="drop" @drop="handleDrop" @dragover="handleDragover" @dragenter="handleDragover">
      <i class="el-icon-upload" />
      <span>将文件拖到此处</span>
    </div>
  </div>
</template>

<script>
// 导入
import XLSX from 'xlsx'

export default {
  props: {
    beforeUpload: Function, // eslint-disable-line
    onSuccess: Function // eslint-disable-line
  },
  data() {
    return {
      loading: false,
      excelData: {
        header: null,
        results: null
      }
    }
  },
  methods: {
    generateData({ header, results }) {
      this.excelData.header = header
      this.excelData.results = results
      this.onSuccess && this.onSuccess(this.excelData)
    },
    handleDrop(e) {
      e.stopPropagation()
      e.preventDefault()
      if (this.loading) return
      const files = e.dataTransfer.files
      if (files.length !== 1) {
        this.$message.error('Only support uploading one file!')
        return
      }
      const rawFile = files[0] // only use files[0]

      if (!this.isExcel(rawFile)) {
        this.$message.error('Only supports upload .xlsx, .xls, .csv suffix files')
        return false
      }
      this.upload(rawFile)
      e.stopPropagation()
      e.preventDefault()
    },
    handleDragover(e) {
      e.stopPropagation()
      e.preventDefault()
      e.dataTransfer.dropEffect = 'copy'
    },
    handleUpload() {
      this.$refs['excel-upload-input'].click()
    },
    handleClick(e) {
      const files = e.target.files
      const rawFile = files[0] // only use files[0]
      if (!rawFile) return
      this.upload(rawFile)
    },
    upload(rawFile) {
      this.$refs['excel-upload-input'].value = null // fix can't select the same excel

      if (!this.beforeUpload) {
        this.readerData(rawFile)
        return
      }
      const before = this.beforeUpload(rawFile)
      if (before) {
        this.readerData(rawFile)
      }
    },
    readerData(rawFile) {
      this.loading = true
      return new Promise((resolve, reject) => {
        const reader = new FileReader()
        reader.onload = e => {
          const data = e.target.result
          const workbook = XLSX.read(data, { type: 'array' })
          const firstSheetName = workbook.SheetNames[0]
          const worksheet = workbook.Sheets[firstSheetName]
          const header = this.getHeaderRow(worksheet)
          const results = XLSX.utils.sheet_to_json(worksheet)
          this.generateData({ header, results })
          this.loading = false
          resolve()
        }
        reader.readAsArrayBuffer(rawFile)
      })
    },
    getHeaderRow(sheet) {
      const headers = []
      const range = XLSX.utils.decode_range(sheet['!ref'])
      let C
      const R = range.s.r
      /* start in the first row */
      for (C = range.s.c; C <= range.e.c; ++C) {
        /* walk every column in the range */
        const cell = sheet[XLSX.utils.encode_cell({ c: C, r: R })]
        /* find the cell in the first row */
        let hdr = 'UNKNOWN ' + C // <-- replace with your desired default
        if (cell && cell.t) hdr = XLSX.utils.format_cell(cell)
        headers.push(hdr)
      }
      return headers
    },
    isExcel(file) {
      return /\.(xlsx|xls|csv)$/.test(file.name)
    }
  }
}
</script>

<style scoped lang="scss">
.upload-excel {
  display: flex;
  justify-content: center;
   margin-top: 100px;
   .excel-upload-input{
       display: none;
        z-index: -9999;
     }
   .btn-upload , .drop{
      border: 1px dashed #bbb;
      width: 350px;
      height: 160px;
      text-align: center;
      line-height: 160px;
   }
   .drop{
       line-height: 80px;
       color: #bbb;
      i {
        font-size: 60px;
        display: block;
      }
   }
}
</style>

注册全局的导入excel组件 

import UploadExcel from './UploadExcel'
export default {
  install(Vue) {
     Vue.component('UploadExcel', UploadExcel) // 注册导入excel组件
  }
}

创建import路由组件

<template>
  <!-- 公共导入组件 --> 
  <upload-excel :on-success="success" />
</template>

配置路由

{
    path: '/import',
    component: Layout,
    children: [{
      path: '', // 二级路由path什么都不写 表示二级默认路由
      component: () => import('@/views/import')
    }]
  },

获取导入的excel数据, 导入excel接口

<template>
  <div>
    <upload-excel :on-success="handleSuccess" />
  </div>
</template>

<script>
import { importEmployee } from '@/api/employees'
export default {
  name: 'Import',

  // created() {
  //   this.handleSuccess()
  // },
  methods: {
    formatDate(numb, format) {
      const time = new Date((numb - 1) * 24 * 3600000 + 1)
      time.setYear(time.getFullYear() - 70)
      const year = time.getFullYear() + ''
      const month = time.getMonth() + 1 + ''
      const date = time.getDate() - 1 + ''
      if (format && format.length === 1) {
        return year + format + month + format + date
      }
      return year + (month < 10 ? '0' + month : month) + (date < 10 ? '0' + date : date)
    },
    // 格式化函数
    // 1.中文字段转英文字段
    // 2.还原exxel中的日期(转为英文格式)
    formatData(header, results) {
      const mapInfo = {
        入职日期: 'timeOfEntry',
        手机号: 'mobile',
        姓名: 'username',
        转正日期: 'correctionTime',
        工号: 'workNumber',
        部门: 'departmentName',
        聘用形式: 'formOfEmployment'
      }
      // 数组转数组map
      const data = results.map(obj => {
        // obj是姓名：xxx 手机号：xxxx
        const newObj = {}
        // 对于所有的obj的属性来说
        // Object.keys(obj)===>['姓名'手机号']
        Object.keys(obj).forEach(zhkey => {
          // 从中文的key转成英文的key
          const enKey = mapInfo[zhkey]
          // 判断key如果是日期的话
          if (enKey === 'timeOfEntry' || enKey === 'correctionTime') {
            // 对日期做特殊的处理,使用函数处理事件对象
            // new Date('2020-12-12')做这个转换，是因为后端需要的标准日期格式
            newObj[enKey] = new Date(this.formatDate(obj[zhkey], '/'))
          } else {
            // value不变
            newObj[enKey] = obj[zhkey]
          }
        })
        return newObj
      })
      return data
    },
    async handleSuccess({ header, results }) {
      // 1. 格式转换
      const data = this.formatData(header, results)
      console.log('做格式转换之后', data)
      // 2.发请求
      const res = await importEmployee(data)
      console.log(res)
      this.$router.back()
      // console.log('做格式转换之前', data)
      // console.log(header, results)
      // 后退
    }
  }
}
</script>