element-ui 自定义 Upload 上传进度条

<el-upload
   class="upload-demo"
   ref="vidos"
   :action="URL+'/api/post/file'"
   :data="date"
   :on-success="handleAvatarAUDIO"
   :before-upload="beforeAvatarAUDIO"
   :on-progress="beforeAvatarUpload" //需要用到此方法
   accept=".mp4"
   :auto-upload="vidoauto"
   :on-change="AvatarAUDIO"
  :file-list="fileList"
 >

beforeAvatarUpload(event, file, fileList){
   let loadProgress = Math.floor(event.percent) //这就是当前上传的进度
   //可以进行其他逻辑
 },