带token的文件的预览

适用于img和video

 function requestImage(fileUrl, element,token) {
  const xhr = new XMLHttpRequest()
  const url = fileUrl
  xhr.open('get', url, true)
  xhr.setRequestHeader('Authorization', `Bearer ${token}`)
  xhr.responseType = 'blob'
  xhr.onreadystatechange = e => {
    if (xhr.readyState === XMLHttpRequest.DONE && xhr.status === 200) {
      element.src = URL.createObjectURL(xhr.response)
      element.onload = () => {
        URL.revokeObjectURL(element.src)
      }
    }
  }
  xhr.send(null)
}