Vue formData實現圖片上傳

import Vue from 'vue'
 
/**
 * 圖片上傳
 * 已注入所有Vue實例，
 * template模板里調用 $uploadFile(id)
 * 組件方法里調用 this.$uploadFile(id)
 */
const uploadFile = (id) => {
 let promise = new Promise((resolve, reject) => {
  let file = null
  let el = null
  let i = 0
  let formData = new FormData()
  document.getElementById(id).click()
  el = document.getElementById(id)
  el.addEventListener('change', function (e) {
   i++
   if (i !== 1) {
    return false
   } else {
    file = this.files[0]
    formData.append('file', file)
    formData.append('fileType', 'IMAGE')
    // 數據請求
    Vue.axiosfrom(Vue.api.upload, formData).then(res => {
     // 返回圖片url
     resolve(res)
    }).catch(err => {
     reject(err)
    })
   }
  })
 })
 return promise
}
 
Vue.prototype.$uploadFile = uploadFile

import Vue from 'vue'
import { baseURL } from '@/config/env'
import axios from 'axios'
 
// formdata 請求
const axiosT = axios.create({
 baseURL: baseURL,
 headers: {
  'Content-Type': 'multipart/form-data'
 }
})
 
const XHR = ({method = 'post', qs = true, loading = false, loginRequire = true, reqComplex = false, reqContentType = 'urlencoded'}) => {
 // 帶請求進度條成功方法
 const sucFunX = res => {
  return res.data
 }
 // 成功執行方法
 const sucFunC = res => {
  return res.data
 }
 // 帶請求進度條失敗方法
 const errFunX = err => {
  console.log(err, NProgress.done())
 }
 // 失敗執行訪求
 const errFunC = err => {
  console.log(err)
 }
 // 判斷是否需要Longing
 const sucFun = loading ? sucFunX : sucFunC
 // 判斷是否需要Longing
 const errFun = loading ? errFunX : errFunC
 return {user, sucFun, errFun}
}
 
// 表單請求 圖片上傳
const axiosfrom = function (url = '', data = {}) {
 let {sucFun, errFun} = XHR({loading: false})
 return axiosT.post(url, data).then(sucFun).catch(errFun)
}
// 表單請求
Vue.prototype.$axiosfrom = axiosfrom
Vue.axiosfrom = axiosfrom