<template>
 <div>
  <el-button type="primary" size="small" :loading="btnLoading" @click="exportFile">導出</el-button>
 </div>
</template>

<script>
import axios from "axios";

export default {
 data() {
  return {
   btnLoading: false
  };
 },
 methods: {
  // responseType 響應類型
  exportFile() {
   this.btnLoading = true;
   axios({
    method: 'get',
    url: '/api',
    headers: {
     token: '79faf82271944fe38c4f1d99be71bc9c'
    },
    responseType: "blob"
   })
    .then(res => {
     this.btnLoading = false;
     if (res.data.type) {
      // 文件下載
      const blob = new Blob([res.data], {
       type: "application/vnd.ms-excel"
      });
      let link = document.createElement('a');
      link.href = URL.createObjectURL(blob);
      link.setAttribute('download', '導出文件.xlsx');
      link.click();
      link = null;
      this.$message.success('導出成功');
     } else {
      // 返回json
      this.$message.warning(res.data.msg);
     }
    })
    .catch(err => {
     this.btnLoading = false;
     this.$message.error("下載失敗");
    });
  }
 }
};
</script>

let baseDownloadUrl = 'http://xxxxxxx:8080' // 域名
const PATH = {
	userList：'vue/export/userList' // 后臺接口地址
}
// 封裝v-out指令
Vue.directive('out', {
	inserted: (el, binding) => {
		el.addEventListener('click', () => {
			console.log(binding.value) // 自定義指令傳請求參數(shù)
			let a = document.createElement('a') // 創(chuàng)建a標簽
			// 處理請求參數(shù)，在url后面拼接
			let params = '?'
			for (let key in binding.value.params) {
				params = params + key + '=' + binding.value.params[key] + '&'
			}
			console.log(params)
			a.style.display = 'none'
			// 測試導出文件
			// link.href =	'https://dl.google.com/tag/s/appguid%3D%7B8A69D345-D564-463C-AFF1-A69D9E530F96%7D%26iid%3D%7BA381F257-9F2F-3652-F0EC-56B9B2C86F92%7D%26lang%3Dzh-CN%26browser%3D4%26usagestats%3D1%26appname%3DGoogle%2520Chrome%26needsadmin%3Dprefers%26ap%3Dx64-stable-statsdef_1%26installdataindex%3Dempty/update2/installers/ChromeSetup.exe'
			// a標簽添加導出地址
			a.href =
				baseDownloadUrl +
				PATH[binding.value.pathName] +
				putCode +
				(params || '')
			a.setAttribute('download', '文件名') // a標簽添加download屬性，導出文件名需要就添加，不需要則為空
			document.body.appendChild(a)
			a.click() // 觸發(fā)a標簽點擊事件
		})
	}
})

<el-button 
  size="small" type="primary" 
  v-out="{
  pathName: 'userList',
  params: //{請求參數(shù)}
}" 
>導出</el-button>

export function expotOut (searchList, pathName, xlsName) {
 // 獲取時間，這一步是在下載時文件名帶下載日期，例如：用戶信息2020-04-27.xls,如無需要可以去掉
 let d = new Date()
 let month = (d.getMonth() + 1)
 let day = d.getDate()
 let time = d.getFullYear() + '-' + (String(month).length > 1 ? month : '0' + month) + '-' + (String(day).length > 1 ? day : '0' + day)
 // 地址
 let baseURL = 'http://xxxxxxx:8080' // 域名
 const PATH = {
  userList：'vue/export/userList', // 后臺接口地址
 }
 // 參數(shù)
 let params = '?'
 for (let key in searchList) {
  params = params + key + '=' + searchList[key] + '&'
 }
 function createObjectURL (object) { return (window.URL) ? window.URL.createObjectURL(object) : window.webkitURL.createObjectURL(object) }
 var xhr = new XMLHttpRequest()
 var formData = new FormData()
 xhr.open('get', baseURL + PATH[pathName] + params) // url填寫后臺的接口地址，如果是post，在formData append參數(shù)（參考原文地址）
 xhr.setRequestHeader('token', localStorage.getItem('token'))
 xhr.responseType = 'blob'
 xhr.onload = function (e) {
  if (this.status === 200) {
   var blob = this.response
   // xls文件名稱
   var filename = `${xlsName}${time}.xls`
   if (window.navigator.msSaveOrOpenBlob) {
    navigator.msSaveBlob(blob, filename)
   } else {
    var a = document.createElement('a')
    var url = createObjectURL(blob)
    a.href = url
    a.download = filename
    document.body.appendChild(a)
    a.click()
    window.URL.revokeObjectURL(url)
   }
  }
 }
 xhr.send(formData)
}

 methods: {
  // 導出
  outFile () {
   expotOut(this.searchList, // 導出請求參數(shù)
    'userList', // 后臺地址PATH對象的key
    '用戶信息'// 導出文件名字
   )
  },
  }