now use  Element-UI  to upload files, and then need to use the  clearFiles  method, but how many failed attempts? 
 the examples found in  Github Issues  did not run successfully either 
https://github.com/ElemeFE/el.
  
 
 now use  Element-UI  to upload files, and then need to use the  clearFiles  method, but how many failed attempts? 
 the examples found in  Github Issues  did not run successfully either 
https://github.com/ElemeFE/el.
  
 
  el-upload  add  ref= "xx" , followed by  this.$refs.xx.clearFiles ()