axios在请求获取文件的时候需要在页面中显示下载进度，通过使用onDownloadProgress来实现我们想要的效果。

axios.get('assets/liku.zip', {
  responseType: 'arraybuffer',
  onDownloadProgress: (progressEvent) => {
    console.log('下载中')
    let percentCompleted = Math.round(progressEvent.loaded * 100 / progressEvent.total)
    console.log(progressEvent.lengthComputable)
    console.log(percentCompleted)
  }
}).then(resp => {
})