1、新建config 写入blobType的对象

export const blobType = {
  xls: 'application/vnd.ms-excel',
  xlsx: 'application/vnd.openxmlformats-officedocument.spreadsheetml.sheet',
  csv: 'text/csv',
  doc: 'application/msword',
  docx: 'application/vnd.openxmlformats-officedocument.wordprocessingml.document',
  pdf: 'application/pdf',
  ppt: 'application/vnd.ms-powerpoint',
  pptx: 'application/vnd.openxmlformats-officedocument.presentationml.presentation',
  png: 'image/png',
  gif: 'image/gif',
  jpeg: 'image/jpeg',
  jpg: 'image/jpeg',
  mp3: 'audio/mpeg',
  aac: 'audio/aac',
  html: 'text/html',
  css: 'text/css',
  js: 'text/javascript',
  json: 'application/json',
  abw: 'application/x-abiword',
  arc: 'application/x-freearc',
  avi: 'video/x-msvideo',
  azw: 'application/vnd.amazon.ebook',
  bin: 'application/octet-stream',
  bmp: 'image/bmp',
  bz: 'application/x-bzip',
  bz2: 'application/x-bzip2',
  csh: 'application/x-csh',
  eot: 'application/vnd.ms-fontobject',
  epub: 'application/epub+zip',
  htm: 'text/html',
  ico: 'image/vnd.microsoft.icon',
  ics: 'text/calendar',
  jar: 'application/java-archive',
  jsonld: 'application/ld+json',
  mid: 'audio/midi audio/x-midi',
  midi: 'audio/midi audio/x-midi',
  mjs: 'text/javascript',
  mpeg: 'video/mpeg',
  mpkg: 'application/vnd.apple.installer+xml',
  odp: 'application/vnd.oasis.opendocument.presentation',
  ods: 'application/vnd.oasis.opendocument.spreadsheet',
  odt: 'application/vnd.oasis.opendocument.text',
  oga: 'audio/ogg',
  ogv: 'video/ogg',
  ogx: 'application/ogg',
  otf: 'font/otf',
  rar: 'application/x-rar-compressed',
  rtf: 'application/rtf',
  sh: 'application/x-sh',
  svg: 'image/svg+xml',
  swf: 'application/x-shockwave-flash',
  tar: 'application/x-tar',
  tif: 'image/tiff',
  tiff: 'image/tiff',
  ttf: 'font/ttf',
  txt: 'text/plain',
  vsd: 'application/vnd.visio',
  wav: 'audio/wav',
  weba: 'audio/webm',
  webm: 'video/webm',
  webp: 'image/webp',
  woff: 'font/woff',
  woff2: 'font/woff2',
  xhtml: 'application/xhtml+xml',
  xml: 'text/xml',
  xul: 'application/vnd.mozilla.xul+xml',
  zip: 'application/zip',
}

2、封装方法获取返回的blob值

import { blobType } from '@/config/global'
import { getPic } from '@/api/uploadCommon' //向后端请求的接口需要增加 responseType: 'arraybuffer',

export function getOssBlob(urlAddress) {
  const startIndex = urlAddress.lastIndexOf('.')
  let file_type = ''
  let result = ''
  if (startIndex !== -1) {
    file_type = urlAddress.substring(startIndex + 1, urlAddress.length).toLowerCase()
  } else {
    this.$message.error('请检查文件格式')
  }
  getPic({data:urlAddress}).then(res => {
    result = window.URL.createObjectURL(
      new Blob([res.msg], {
        type: blobType[file_type]
      })
    )
  })
  return result
}