el-upload使用http-request覆蓋默認上傳行為調出默認的進度條

        <el-upload 
          accept=".doc,.pdf"
          ref="upload"
          :show-file-list="true"
          :action="void"
          :http-request="upLoadOnSelf"
          :on-progress="uploadOnProgress"
          :fileList="flieList">
              <el-button type="primary">點擊上傳</el-button>
        </el-upload>
    </div>　　

然后method里面的方法

upLoadOnSelf（fileParam）{
 const fileObj =fileParam.file; 
 const form = new FormData(); 
 form.append("file", fileObj); 
 this.$http.post(`/file/upload`, form, 
 {onUploadprogress:function(event){ 
    percent = event.loaded/event.total*100 
    fileParam.onProgress({percent:percent }) 
  } 
 }).then(res={//處理成功情況
 fileParam.onSuccess()//顯示完成按鈕小圖標
    ...//其它處理
 }) 
}，
uploadOnProgress（event,file,fileList）{
   this.progress=event.perecent  //調用默認的進度條
}