今天说一种vue下载二进制流文件的方法：后台直接返回文件的二进制内容，然后前端转化再下载。具体内容如下

    instance.post(EXPORT_REPAYMENT_DETAIL, data, {
        responseType: 'blob'
      }).then((response) => {
        if (response.status === 200) {
          let blob = new Blob([response.data], {
            type: 'application/vnd.ms-excel'
          })
          let objectUrl = URL.createObjectURL(blob)
          const a = document.createElement('a')
          let disposition = response.headers['content-disposition']
          let fileName = decodeURI(
            disposition.split(";filename*=utf-8''")[1]
          )
          a.download = fileName
          a.href = objectUrl
          a.click()
          a.remove()
          let successMsg = this.$t('global_public.success')
          this.$globalToast.popupMessage(successMsg, 2, 2000)
        }
      })

值得注意的是,请求接口时必加 “responseType: 'blob'”不然下载下来文件有问题

文件默认下载的为excel格式文件,其他文件请自行修改type类型

这里举例一些常用的类型

'ppt'        => 'application/vnd.ms-powerpoint',
'dir'        => 'application/x-director',
'js'        => 'application/x-javascript',
'swf'        => 'application/x-shockwave-flash',
'xhtml'        => 'application/xhtml+xml',
'xht'        => 'application/xhtml+xml',
'zip'        => 'application/zip',
'mid'        => 'audio/midi',
'midi'        => 'audio/midi',
'mp3'        => 'audio/mpeg',
'rm'        => 'audio/x-pn-realaudio',
'rpm'        => 'audio/x-pn-realaudio-plugin',
'wav'        => 'audio/x-wav',
'bmp'        => 'image/bmp',
'gif'        => 'image/gif',
'jpeg'        => 'image/jpeg',
'jpg'        => 'image/jpeg',
'png'        => 'image/png',
'css'        => 'text/css',
'html'        => 'text/html',
'htm'        => 'text/html',
'txt'        => 'text/plain',
'xsl'        => 'text/xml',
'xml'        => 'text/xml',
'mpeg'        => 'video/mpeg',
'mpg'        => 'video/mpeg',
'avi'        => 'video/x-msvideo',
'movie'        => 'video/x-sgi-movie',