IOS打开文件标题乱码

previewFile(item) {
      // this.previewFileBtn(item.url, item.fileName, (err) => { this.$api.msg(err) })
      const _self = this
      upload.previewFile(item.fileUrl, function(err) {
        _self.$api.msg(err)
      }, item.fileName)
    }


const previewFile = (url, fail, fileName = '附件文件') => {
  const fileType = url.substring(url.lastIndexOf('.') + 1, url.length)
  // #ifdef APP-PLUS
  const name = fileName.indexOf('.') > -1 ? fileName : `${fileName}.${fileType}`
  const dtask = plus.downloader.createDownload(url, { filename: name }, function(d, status) {
    if (status === 200) {
      const filePath = d.filename
      console.log(fileType, { filePath, name, url })
      if (/\.(png|jpg|gif|jpeg|webp)$/i.test(url)) {
        uni.previewImage({
          urls: [filePath]
        })
      } else {
        uni.openDocument({
          filePath,
          fileType,
          fail
        })
      }
    } else {
      fail('Download failed: ' + status)
    }
  })
  dtask.start()
  // #endif

  // #ifndef APP-PLUS
  uni.downloadFile({
    url,
    success: (res) => {
      const filePath = res.tempFilePath
      if (/\.(png|jpg|gif|jpeg|webp)$/i.test(url)) {
        uni.previewImage({
          urls: [filePath]
        })
      } else {
        uni.openDocument({
          filePath,
          fileType,
          fail
        })
      }
    }
  })
  // #endif
}